Count particular character in a string - bash
Suppose:
$ string="unix bash script tutorial"
Now if I have to count the number of "i" s in the $string,
$ string="${string//[^i]/}"; echo ${#string}
3
or
$ echo $((`echo $string|sed 's/[^i]//g'|wc -m`-1))
3
Where
-m (print the character counts, an wc option)
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1 comment:
To determine the count of a char. in a given string we can do the following:
1. printf '%s\n' "$string" | tr -cd 'i' | wc -m
2. printf '%s\n' "$string" | perl -ple '$_ = tr/i//d'
3. printf '%s\n' "$string" | sed -e 's/[^i]//g;/i/!Q;s///' | wc -m
4. ( IFS="i"; set -f; set X $string; shift 2; echo "$#" )
We execute the step-4 in a subshell to ensure that changes to `super-globals',
like, "IFS", "set -f", "$#", do not corrupt the current settings.
N.B.: Some characters for which count is being determined, might be special and should be appropriately quoted, e.g., "^".
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