There are two approaches you can try to filter out lines: awk ‘NF’ data.txt and awk ‘length’ data.txt Just put these at the start of your command, i.e., awk -v variable=$bashvariable ‘NF { print variable … }’ myinfile or awk -v variable=$bashvariable ‘length { print variable … }’ myinfile Both of these act as gatekeepers/if-statements. … Read more
The POSIX way awk ‘/pattern1/ || /pattern2/{print}’ Edit To be fair, I like lhf‘s way better via /pattern1|pattern2/ since it requires less typing for the same outcome. However, I should point out that this template cannot be used for logical AND operations, for that you need to use my template which is /pattern1/ && /pattern2/
To print every second line, starting with the first: awk ‘NR%2==1’ file.txt To print every tenth line, starting with the tenth line: awk ‘NR%10==0’ file.txt To use this in a script, add the following to a file called script.awk: BEGIN { print “Processing file” } NR%10==0 END { print “Finished processing” } Then execute: awk … Read more
The file you give is a shell script, not an awk program. So, try sh my.awk. If you want to use awk -f my.awk life.csv > life_out.cs, then remove awk -F , ‘ and the last line from the file and add FS=”,” in BEGIN.
awk -v x=2 ‘{print $x}’ or in a shell script: #!/bin/sh num=$1 awk < /tmp/in -v x=$num ‘{print $x}’ > /tmp/out
Awk can easily detect multi-line combinations of patterns, but you need to create what is called a state machine in your code to recognize the sequence. Consider this input: how second half #1 now first half second half #2 brown second half #3 cow As you have seen, it’s easy to recognize a single pattern. … Read more
$ pr -mts’ ‘ file1 file2 1 1 6 2 3 7 3 4 9 $ paste -d’ ‘ file1 file2 1 1 6 2 3 7 3 4 9
I’m not sure if I got your question right, so here are some shots in the dark: Print last occurence of x (regex): grep x file | tail -1 Alternatively: tac file | grep -m1 x Print file from first matching line to end: awk ‘/x/{flag = 1}; flag’ file Print file from last matching … Read more
How about this? $ cat file John\nDoe Sara\nConnor $ awk ‘{gsub(/\\n/,”\n”)}1’ file John Doe Sara Connor
One way using GNU awk and FPAT awk ‘BEGIN { FPAT = “([^, ]+)|(\”[^\”]+\”)” } { sum+=$3 } END { print sum }’ file.txt Result: 192