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linux - Hide "No such file or directory" when 'cat' nonexistent file 본문

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linux - Hide "No such file or directory" when 'cat' nonexistent file

준호씨 2018.01.23 21:34

You can see stderr "No such file or directory" when you 'cat' none exists file

$ cat nonexistent_file
cat: nonexistent_file: No such file or directory

If you want to hide stderr, attach 2>/dev/null after command

cat nonexistent_file 2>/dev/null

Tip

'grep' command has '-s' option to hide error message about nonexistent or unreadable files.

       -s, --no-messages
              Suppress error messages about nonexistent or unreadable files.  Portability note: unlike GNU grep, 7th Edition Unix grep did not conform to  POSIX,
              because  it  lacked -q and its -s option behaved like GNU grep’s -q option.  USG-style grep also lacked -q but its -s option behaved like GNU grep.
              Portable shell scripts should avoid both -q and -s and should redirect standard and error output to /dev/null instead.  (-s is specified by POSIX.)
$ grep nonexistent_file something
grep: something: No such file or directory
$ grep nonexistent_file something -s

References

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