Awk find last occurrence of a character. if 7th character is o , Output.

Awk find last occurrence of a character. awk '/ b / {print NR;exit}' textFile. Here is the sample data: file1 In file1, I want to have all instances replace where _o is appearing in the end of a word with _g. The field separator is also a semicolon. awk split on first occurrence of character. Now create a loop and print the contents of the pattern space until the last pattern is matched. mp3" as input. Let’s see how we can define it in the BEGIN block and get the individual values: $ awk 'BEGIN { FS=","; } { print $1 }' numbers. If you do not use double quotes, basename will not work with path where there is space character: I'm trying to replace the last occurrence of a character in a field with awk. Of course this works for any possible string - even an empty one - which means both forms will print newline characters for lines which contain only blank characters or none at all. Nov 27, 2015 · awk 'BEGIN{RS=" "} {a[$1]++} END{for(i in a){if(a[i]>m){m=a[i];f=i}else if(a[i]>n){n=a[i];s=i}}print "max:",f,"\n2nd max:",s}' file BEGIN{RS=" "} sets the row separator of awk to space. Dec 25, 2011 · To count occurrence of a character per line you can do: awk -F'|' 'BEGIN{print "count", "lineNum"}{print gsub(/t/,"") "\t" NR}' file count lineNum 4 1 3 2 6 3 To count occurrence of a character per field/column you can do: column 2: Apr 24, 2024 · Method 3 – Utilizing an Array Formula in Excel to Find Position of Last Occurrence of Character in String. 1 a 1 2 a 2 3 a 3 1 b 1 2 b 2 3 b 3 1 c 1 2 c 2 3 c 3 In such a text file, i want to find the line number of the last appearance of b which is 6. One strategy might be to place your input into an array, for assessment: Nov 21, 2018 · The easiest way to do this in one go is to use a tool that can search backward, ed is one of them. Jun 21, 2017 · As I mentioned, requiring only the last complete block to be printed does introduce some complexity as you need to make sure you find the last block of text that starts with FIXES but only overwrite the previous such block if the current one ends with Committed as THAT would be the last complete block in the file even though there's a FIXES May 14, 2022 · How to write a sed (or awk, or both) which will take the following: echo '1 aa 2 2 3 bb 5 bb 2 5' | sed/awk And only replace the n-th occurrence of a string? For example the 3rd occurrence of 2 or the second occurrence of bb? So the expected output would be (when replacing 2nd occurrence of bb with replaced for example): 1 aa 2 2 3 bb 5 Feb 8, 2012 · EDIT: I just saw a better answer to this post, but posting this anyway, as it might be helpful if you want to do something more complex, like substituting things. In this case, the line after the 3rd occurrence of <Car&g Jan 28, 2015 · So when the replacement is made all of the string is replaced with only the last occurrence on a line of zero or more not blank characters - or the subgroup \2. b. insert. Mar 23, 2017 · You need to use. The result is supposed to look like this: As in sub(), the characters ‘&’ and ‘\’ are special, and the third argument must be assignable. tac reverses the order of the lines in the file, so the awk command ends up removing the last comma. I have tried the following in awk: Oct 15, 2014 · If the comma might not be on the second-to-last line Using awk and tac: tac foo. I tested (\. uniq -c. Here, [^:]* (a [^] is a negated bracket expression) will match 0+ chars other than :, so, only the last : is matched with the first :. pattern1=3. Jan 28, 2021 · I tried the command sed '/^[0-9]/ s/. Simply put AWK will use / as delimiter, and if your path is /my/path/dir/ it will use value after last delimiter, which is simply an empty string. passing the results of awk command as a parameter. The sed solution works only if there are a single digit after the _ . Given is a file like this one: John,Doe,Abc fgh 123,Abc John,Doe,Ijk-nop 45D,Def John,Doe,Qr s Uvw 6,Ghi I want to replace the last space " " with a comma ",", basically splitting the field into two. We’re going to use the ROW function, the INDEX function, the MATCH, the MID, and the LEN functions to create an array formula to find the position of the last occurrence of a character in a string. Nov 27, 2015 · Use awk to find first occurrence. Search the string in for the first occurrence of the string find, and return the position in characters where that occurrence begins in the string in. e. Apr 7, 2011 · replacing a particular instance in a string globally. With the extra data, you can still do this with a single run of awk, but of course the awk script is getting more complex with each new requirement. Can someone help me write an awk script? Using sed would be okay too. Feb 6, 2016 · This means you can't safely use awk's field separator to find your data (though you can use it for field names), making index() a reasonable approach. Input file: some text. a[$1]++ fills an array a with the values as indexed and the number of occurences as values. Thus the awk command above holds the entire file content in an array. if 7th character is d , Output should be: d_hosts = N 3. They also work very well in handling text files. Try: awk '{print $1, $(NF - 1)}' Input_file Jun 22, 2022 · The awk solution works only if there are exactly 3 or 2 fields, it doesnt work on names like : a_b_c_d_1. It counts positions from zero rather than one (zero is more commonly used for the first character position). awk split on a different token. 2. Additionally, the grep command is more flexible and user-friendly. The pattern looks for lines containing just abc to just mno, and then executes the actions in the { Mar 3, 2014 · awk or other way to find out number of occurrence of 7th character Hi all, I am looking for to filter out based on 7th character and list the number of occurrence based on the 7th character if p , d , o or m 1. sort the results. For systems with very low resources, grep is more efficient than awk or sed. For example, @Thor's answer shows an appreciation of bash parameter expansion feature, which works well if OP is using bash too. Hi, I'm trying to update the last two characters coming in a string globally in a file. For the last occurrence I printed "set define off" after last match of Table. csv | awk '/,$/ && !handled { sub(/,$/, ""); handled++ } {print}' | tac The awk command is a simple one to do the substitution the first time the pattern is seen. . )(?!. When this last pattern is found, sed Apr 3, 2015 · As you can see, after finding first occurrence of Table I printed "set define on" before the first occurrence. pattern1=1. Steps: Input the formula below into Jun 19, 2016 · Good question, but it's better to mention your platform when it comes to sed and awk questions, because the GNU implementations of these utilities have many more features that won't work on non-Linux platforms (by default); case in point: your own answer requires the GNU utilities. I can find the first appearance with . So far I have this: sed -i 's/\(. How can I limit this to just the last occurrence? Oct 5, 2015 · The only pattern that remains the same throughout this file is [Important], everything else changes, including the number of lines between each occurrence of [Important] I'm trying to take the end of this file, ignore the last occurrence and find the 2nd to last, then extract the remaining contents of the file into another. Its syntax Sep 9, 2018 · This code would work best if it's known in advance that the last match is known to be near the end of a large file. //' and as expected it replaces all the numbers, but I don't know how to make it replace only the second occurrence of each number in the range. if 7th character is o , Output (10 Replies) Jun 19, 2009 · Hello how to find last occurence of a string for example in the following I want last occurence of '-' i. sort. In the example, if the pattern then contains two leading null characters, pull the pattern out of holdspace. How it works ? Well, duplicate the last line, search for your keyword backwards, insert the text or the content of the file before that line, delete the duplicated last line, write, quit. Jun 19, 2017 · If you really don't want the / before the last xyz, then the second echo should be what you're looking for; if leaving the trailing / is acceptable, the first does that. *\)}/\1/' file But this removes as many } as there are on the end of the file. ) Aug 23, 2022 · I have a huge file contains two types of patterns say pattern1 and pattern2, pattern1 may appear many times before pattern2 appears. For example, if it was: Account number: 1234567 awk should return: 1234567 Once it's found the first occurrence it can stop looking. Note: The lines with Table can appear in the first line of the file or middle or last. Consider the following example: May 30, 2013 · Hi all, I am looking for to filter out based on 7th character and list the number of occurrence based on the 7th character if p , d , o or m 1. Then deletes the last character in the last line of the file. Input file: some text pattern1=1 some lines pattern1=2 some lines pattern1=3 some lines pattern2 some lines pattern1=4 some lines pattern1=5 some lines pattern1=6 some lines pattern1=7 some lines pattern2 Feb 27, 2018 · % x=abracadabra % echo ${x//a/o} obrocodobro Hmph Is there a way to replace the last occurrence of a pattern using shell substitions (IOW, without rolling out sed, awk, perl, etc. The same applies to newlines, except the last one. The expected result is: Aug 28, 2012 · Strings are really slow in C, due their specific nature (being 0x00 ended): strrchr() go from the beginning to the end of the string (either by calling strlen() to know the end of the string, that traverse the whole string, then taking it from the end until it find the character, either by doing it in a simple pass until the end of the string). To Aug 5, 2011 · I am trying to replace the nth occurrence of a character or string regardless of the line using awk. *\1) as a regex on regex101. I want to grep the last occurrence of each pattern1 before each pattern2. May 28, 2013 · Hello how to find last occurence of a string for example in the following I want last occurence of '-' i. txt Apr 25, 2017 · Swap the pattern space with the hold space and append a null character to the start of the pattern. Ideally you would have the text saved in a file (e. The awk command simply compares the first column to the given string, and if we haven't yet made a replacement (!flag is non-zero), we modify the third column as soon as we May 31, 2019 · I have an input file that looks like this and i want the first occurrence of words but only after the first occurrence of special The numbers are only there so i know i got the right string EDIT: I realized that it matters the strings have /'s Nov 26, 2015 · good day all. But, I'm stumped. 0. txt 10 14 1 8 111 May 16, 2014 · So the positive about this is that there's no fork, no external process (why do we care?) but the negatives are that you still need to write more code to manage the scope of the IFS change, plus if you want to do this on more than 1 line you need to manually write a loop to process every line (unlike sed and awk solutions), plus as written it will handle any backslashes in the input Apr 7, 2011 · Hi, I'm trying to update the last two characters coming in a string globally in a file. This has a regex which assumes Statistics is at beginning of line; tweak if that's incorrect. Let's try this as a longer one-liner: $ awk 'BEGIN{v["G"]; v["A"]; v["C"]; v["T"]} $4 in v && $5 in v {a[$4 $5]++} END {for (p in a) printf("%s %d\n", p, a[p])}' i CT 1 TA 1 TC 1 AG 2 May 24, 2020 · If I understand your question correctly, you want to print two fields: the first one and the last but one, and the number of fields is not the same for each row. index (in, find) ¶. )? Mar 11, 2013 · What I need to do is be able to parse through the files, and find the account number itself. One main difference between these two is that the grep command considers the 0-byte index, while the awk doesn’t. pattern1=2. So it's best to avoid trailing slash if you need to do Aug 1, 2013 · Using sed:. Aug 23, 2022 · I want to grep the last occurrence of each pattern1 before each pattern2. if 7th character is o May 20, 2015 · If the data is in a variable, you can use parameter expansion: $ var=123:abc $ echo ${var#*:} abc $ The # means to remove the shortest pattern of *: (anything followed by a colon) from the front of the string, as you said in your requirement "delete all the characters up to the first occurrence of certain character + that character", not to get the second field where the delimiter is the colon. awk 'match($0,/^<[^>]*>/){print substr($0,RSTART+RLENGTH)}' Input_file OR In case you have lines which are not starting from < and you want to print them also then use following: I am looking to display the line 4598 in the following file. g. Other functions like 'cut' or 'awk' or 'sed' are always mentioned but never using the string expression function (I think it is called) Mar 3, 2015 · @Psirus I hope this isn't going to open up a can of worms, but the idea of using lesser operations is to showcase a certain level of mastery of the lesser operations. if 7th character is o , Output should be: o_hosts = N Jul 1, 2010 · @eckes In case of AWK solution, on GNU bash, version 4. 48(1)-release that's not true, as it matters whenever you have trailing slash or not. c. Feb 1, 2017 · I am looking for to filter out based on 7th character and list the number of occurrence based on the 7th character if p , d , o or m 1. Apr 21, 2024 · We’ll begin with its syntax and usage, move on to handling case sensitivity and special characters, and learn how to find multiple occurrences of a substring. Another way to do this as is to use the sedcommand and let it substitute (with the s command first in the regex) everything except that which you want (which is collected into the variable \1 by the parentheses: Oct 11, 2011 · Your example script has a space before Statistics but your sample data doesn't seem to. – DanieleGrassini Sep 2, 2021 · 2nd solution: Using match function of awk here match values from 1st occurrence of < to till 1st occurrence of > and print the rest of line. /:[^:]*$/. Mar 5, 2023 · I am trying to use awk to replace the last occurrence of a period in the first field with a semicolon. Consider the following example: $ awk 'BEGIN { print index ("peanut", "an") }' -| 3. For example. Mar 18, 2024 · awk can split the input parameters using the field separator (FS) character. So if my file looks like this: foo bar } } } that command will remove all 3 of the } characters. sed -n -e '/^abc$/,/^mno$/{ /^abc$/d; /^mno$/d; p; }' The -n option means do not print by default. 9. Sep 9, 2018 · The x and p only run on the last line: x loads the hold buffer to the active buffer, and //p prints it if it contains a ====. count the number repeated occurrences Feb 28, 2018 · Classic solution with awk, that treats / as field separator for both input and output and sets the last field to empty string ( which really is "dereferencing" of the number of fields NF variable ): Mar 18, 2024 · Both the grep and awk commands offer effective ways to find the character’s position from the text. 1. ” (dot) refers to any character and $ specifies the last line within the file. How to replace all instances of a character except the last n . com and it correctly highlights the last occurrence of a period when I supply "a. 3. To replace it in a multiline string shell variable, with GNU sed , you can use the -z option which treats the input as NUL delimited instead of newline delimited: May 26, 2017 · Last three characters of string: ${string: -3} or ${string:(-3)} (mind the space between : and -3 in the first form). some lines. If find is not found, index () returns zero. index(in, find) ¶ Search the string in for the first occurrence of the string find, and return the position in characters where that occurrence begins in the string in. Oct 29, 2013 · Here is a function that will give a single character offset without calling an external program like expr. Jun 3, 2014 · I'm trying to use sed to remove the last occurrence of } from a file. Lastly, we will discuss validating user input using the awk index function. position 12 str="aa-bbb-cccc-ddd-ee" my pupose is to get the string 'ee' Thanks and Regards Chetanz (5 Replies) Print last occurence of x (regex): grep x file | tail -1 Alternatively (should be faster because it reads from the end): tac file | grep -m1 x Print file from first matching line to end: awk '/x/{flag = 1}; flag' file Print file from last matching line to end (prints all lines in case of no match): tac file | awk '!flag; /x/{flag = 1};' | tac Aug 26, 2021 · How to find specific character/string at the end of each line of a file and add that character if missing except the last line? -1 Use grep or awk to get the second value of a string Mar 18, 2024 · The function sub is a built-in string function in awk. Moreover, you don't know the value of the last field. this is a noob question, but I can't seem to find the answer to this anywhere. The “. It substitutes the last character s with an empty string ” “. position 12 str="aa-bbb-cccc-ddd-ee" my pupose is to get the string 'ee' Thanks and Regards Chetanz (5 Replies) Oct 3, 2013 · Use awk to find first occurrence only of string after a delimiter. Please refer to the Shell Parameter Expansion in the reference manual: ${parameter:offset} ${parameter:offset:length} Expands to up to length characters of parameter starting at the character specified by offset. So, awk needs to look for Account number: and return the string immediately following. Share Improve this answer Jul 31, 2019 · The last line is where the 1st column is a particular string is easier to find that way. Jun 24, 2021 · Using sed, how can I replace the Nth to last occurrence of a character on each line of a given file? In this case I want to replace the 3rd to last ; with ,. if 7th character is p , Output should be: p_hosts = N 2. See also Glenn Jackman's answer with variants for awk and sed which avoid the need for 999999. txt) and insert the file content two lines before the last occurrence of PATTERN so you could run: To match on | followed by something that doesn't contain | til the end of line as already shown by Toby, but that approach only works for single character replacements. (The // pattern means to use the previous pattern, so it's just a shorthand for /====/ . Effectively I want to display the line AFTER the nth occurrence of a match. Jan 20, 2017 · Note that backslashes, ampersands and delimiters have to be escaped in the RHS of a substitution. To avoid guessing, some added stat ugliness would work: It should be a comment to the basename answer but I haven't enough point. May 7, 2013 · I want to find the last appearance of a string in a text file with linux commands. input Jun 30, 2024 · keep track of the last line number containing a comma with the last_occurrence variable; define the position_last_comma variable to store the last comma position for this line; print each line from the buffer array in the END block; Only for the last_occurrence line, we use the sub_at_position() function to remove the comma marked by the Jan 16, 2015 · awk '{print $3}' file | sort | uniq -c awk '{print $3}' print the 3rd column , the default record separator in awk is white space. awk unexpectedly removes dot from string. gkjoca noafm hjr jawnm xowlxhv gdvcvukb knuzve zavydt tcenjz qejh