find difference between two text files with one item per line

Question

I have two files   file 1  dsf sdfsd dsfsdf   file 2  ljljlj  lkklk  dsf sdfsd dsfsdf   I want to display what is in file 2 but not in file 1  so file 3 should look like  ljljlj  lkklk

User · Answer

If you want to use loops You can try like this: (diff and cmp are much more efficient. )

while read line
do
    flag = 0
    while read line2
    do
       if ( "$line" = "$line2" )
        then
            flag = 1
        fi
     done < file1 
     if ( flag -eq 0 )
     then
         echo $line > file3
     fi
done < file2

Note: The program is only to provide a basic insight into what can be done if u dont want to use system calls such as diff n comm..

User · Answer

With GNU sed   sed  s        amp   g s        g s       s     d   file1   sed -f- file2   How it works   The first sed produces an output like this      d  s  f   d    s  d  f  s  d   d    d  s  f  s  d  f   d   Then it is used as a sed script by the second sed

User · Answer

A tried a slight variation on Luca s answer and it worked for me   diff file1 file2   grep   gt     sed  s   gt    g   gt  diff file   Note that the searched pattern in sed is a  gt  followed by a space

User · Answer

an awk answer    awk  NR    FNR  file1  0     next     0 in file1   file1 file2

User · Answer

You can try  grep -f file1 file2   or  grep -v -F -x -f file1 file2

User · Answer

if you are expecting them in a certain order  you can just use diff  diff file1 file2   grep   gt

User · Answer

You can use the comm command to compare two sorted files  comm -13  lt  sort file1   lt  sort file2

User · Answer

file1  m1 m2 m3  file2  m2 m4 m5   awk  NR    FNR  file1  0     next     0 in file1   file1 file2 m4 m5   awk  NR    FNR  file1  0     next    0 in file1   file1 file2 m2    What s awk command to get  m1 and m3      as in file1 and not in file2   m1 m3

User · Answer

join -v 2  lt  sort file1   lt  sort file2

User · Answer

grep -Fxvf file1 file2   What the flags mean   -F  --fixed-strings               Interpret PATTERN as a list of fixed strings  separated by newlines  any of which is to be matched      -x  --line-regexp               Select only those matches that exactly match the whole line  -v  --invert-match               Invert the sense of matching  to select non-matching lines  -f FILE  --file FILE               Obtain patterns from FILE  one per line   The empty file contains zero patterns  and therefore matches nothing

User · Answer

I successfully used  diff    file1      file2     grep   lt     sed  s   lt   g   gt     diff file     Outputting the difference to a file

[bash] find difference between two text files with one item per line

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