Tuesday, March 3, 2009
Concatenate only digits from string - bash tr
Just to introduce a good use of Linux tr command; if you need to concatenate the digits from a string, here is a way:
$ echo "Abc123d56E" | tr -cd '[[:digit:]]'
Output:
12356
From tr man pages:
SYNOPSIS
tr [OPTION]... SET1 [SET2]
-c, -C, --complement: first complement SET1
-d, --delete : delete characters in SET1, do not translate
Similarly:
$ echo "Abc123d56E" | tr -d '[[:digit:]]'
Output:
AbcdE
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1 comment:
Thank you for this tip. I never would have figured it out reading the manpage.
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