01-06-2015
Often for such tasks 'grep -c ... yourdir/* |sed' is good, where sed can change the counts into na or whatever. Sometimes * makes the command line too long or the arg count too high, your OS may vary, but the usual fix is something that starts with 'find' configured for running grep with many file names, sometimes aided by '|xargs -n101' if 'find' lacks that option.
The disadvantage of that grep is the reading of a big file entirely, when the target line is at the front. You could use grep -l to get the set of file names with the pattern, and then use 'comm' to beat it against the set of the full list of tested files (lists must be binary sorted), then use 'sed' to deal with the hit and miss labeling.
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ZGREP(1) General Commands Manual ZGREP(1)
NAME
zgrep - search possibly compressed files for a regular expression
SYNOPSIS
zgrep [ grep_options ] [ -e ] pattern filename...
DESCRIPTION
Zgrep invokes grep on compressed or gzipped files. These grep options will cause zgrep to terminate with an error code:
(-[drRzZ]|--di*|--exc*|--inc*|--rec*|--nu*). All other options specified are passed directly to grep. If no file is specified, then the
standard input is decompressed if necessary and fed to grep. Otherwise the given files are uncompressed if necessary and fed to grep.
If the GREP environment variable is set, zgrep uses it as the grep program to be invoked.
EXIT CODE
2 - An option that is not supported was specified.
AUTHOR
Charles Levert (charles@comm.polymtl.ca)
SEE ALSO
grep(1), gzexe(1), gzip(1), zdiff(1), zforce(1), zmore(1), znew(1)
ZGREP(1)