My result must be all grep files with Error but. If you don't do that, you can end up in a normal iterative shell (rather than this one-shot, non-iterative, non-interactive shell) with multiple shell processes all trying to read from the terminal at the same time, which leads to chaos and confusion. Hi Id like to combine grep and after that ls something like that grep -i Error frm.txt ls -lrt. It is crucial that you report the error and that the child process then exits. It can happen when the user mistypes a command name, for example. If any of the exec*() functions returns, it failed. The real solution is to use the find utility, which can search through sub-directories and provides the most resilient way to search for. You should report failures after execvp(). to list files this way, or use wildcards in any other command, and it isnt a real solution for searching filenames like how grep searches content. This looks for a dot and a c at the end of the line. But the answer has been updated to use -null anyway.
LS GREP MAC OS X
You are looking for files whose name contains ".c" (where the double quotes are part of the file name being searched for). Note that the -Z option is non-standard it is supported by GNU grep it is not supported on Mac OS X for example.Or, more precisely, on Mac OS X, the -z and -Z options mean decompress and -null prints nulls after the file name.
When you use dup2() to replicate a file descriptor from a pipe to standard input or standard output, you should close both file descriptors returned by pipe().Ī second problem is that the shell removes double quotes around arguments but you've added them around your. One problem is that you have far too few calls to close().
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