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expr Here are a few examples, including quoting for shell metacharacters.
To add 1 to the shell variable foo, in Bourne-compatible shells:
foo=`expr $foo + 1` |
To print the non-directory part of the file name stored in
$fname, which need not contain a /.
expr $fname : '.*/\(.*\)' '|' $fname |
An example showing that \+ is an operator:
expr aaa : 'a\+' => 3 |
expr abc : 'a\(.\)c' => b expr index abcdef cz => 3 expr index index a error--> expr: syntax error expr index quote index a => 0 |