Sergiu wrote: >> please find an error detected when is used a combination of "xargs" and >> "grep", arguments {} are not substituted in grep construction:
I believe that all your examples, both expected (count of "1" resulting) and apparently unexpected (outputs of "i i 0") are working as expected. I am guessing (am I right?) that you were expecting outputs of "i i 1" or some such from your last six more complex examples using xargs, however that "echo inga | grep -c $a" is working on an $a value that is still inside the $( ... ) or ` ... ` command substitution, and thus equal to '{}', with $a not yet set to "i" by the final execution of the xargs invocation of the output from that command substitution. -- Paul Jackson p...@usa.net