BUT this is granted when there is NO duplicated lines in both files themselves, else below is always granted even if there is a lines duplicated within both files. This will print both files sorted then uniq -d will print only duplicated lines. For each line in file2 it will print every line that was marked as present =1 in file1 in the array.Īnother simple option is using sort and uniq: sort file1 file2|uniq -d Then next condition seen will apply only for the second input file2. The next statement telling awk to not continue the rest of the code and rather start over again until NR is not equal to FNR, which means all lines of file1 are read by awk. So, FNR is unique for each input file whereas NR is unique for all inputs files.) We used NR=FNR as a condition to run the following block only for the first input file1 and not file2 ( NR is referring to the number of records across all inputs, and FNR is the file number of records for each individual input. example: johnawesome echo -e 'test test test another test test' test test test another test test johnawesome echo -e 'test test test another test test' sort uniq another test test depending on the data you may want to utilize some of the switches as well. This is reading the whole line of file1 into an array called seen where the key is a whole line (in awk the $0 represents the whole current line). 153 You can achieve this with the sort and uniq utilities. We often use it to check the number of times of a words, phrases, strings in a text file or patterns to find the number of occurrences of files with specific names under folders. The F option is telling grep that match pattern as a string not a regex match. Linux grep command is one of the most commonly used command-line tools. Or using grep command you need to add -x option to match the whole line as a matching pattern. 2 suppress column 2 (lines unique to FILE2) comm -12 <(sort file1) <(sort file2)įrom man comm: -1 suppress column 1 (lines unique to FILE1) You may also needs your file to be sorted to comm to work as expected. Use comm -12 file1 file2 to get common lines in both files.
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