Need help to find difference between two files

UNIX Solaris
1

I need to find the difference between two files in UNIX. I tried diff, but couldn't get it right.

There are two files:

file1:

       apple
       mango
       strawberry
       banana
       grape

file2:

       grape
       apple
       banana

I need an output file like below:

       mango
       strawberry

Can anyone please help? Thanks in advance...

2

while read line;do

while read line;do
grep -qw "$line"  FILE2
[$? -ne 0 ] && { echo "$line" } 
done < FILE1
3

You could also try:

$ grep -vf file2 file1
mango
strawberry
4

The following error occurs:
syntax error at line 7: `done' unexpected

---------- Post updated at 12:15 PM ---------- Previous update was at 12:14 PM ----------

This error occurs:
grep: illegal option -- f
Usage: grep -hblcnsviw pattern file . . .

5

I only said you could try :slight_smile:

$ awk 'NR==FNR { F[$1]=1; next } !F[$1]' file2 file1
mango
strawberry

There's a space missing from rrstone's test is all:

[$? -ne 0 ]

should be

[ $? -ne 0 ]

edit: PS, if you're using Solaris, use /usr/xpg4/bin/awk or nawk

6

"The following error occurs:
syntax error at line 7: `done' unexpected"

I am sorry , there are 4 lines in my script .

7

I guess today is my error day!!!
awk 'NR==FNR { F[$1]=1; next } !F[$1]' file2 file1
F[: Event not found.

---------- Post updated at 12:26 PM ---------- Previous update was at 12:24 PM ----------

Well, actually this was the script I wrote:
#!/bin/sh

while read line
do
grep -qw "$line" file2
[$? -ne 0 ] && { echo "$line" }
done < file1

---------- Post updated at 12:28 PM ---------- Previous update was at 12:26 PM ----------

The same error occurs, even if the space problem is resolved

8 
#!/bin/sh

while read line; do
        grep -qw "$line" file2
        [ $? -ne 0 ] && {
                echo "$line"
        }
done < file1
9

This should work:

diff <(sort file1) <(sort file2) | sed 's/^[^ ]*//'
10

you can try :-

sort -o file1 file1
sort -o file2 file2
comm -23 file1 file2

11 
sort file1 file2 | uniq -u
12

On Solaris you need the grep in /usr/xpg4/bin in order to use the -f switch:

$ /usr/xpg4/bin/grep -vf file2 file1
mango
strawberry