12-21-2018
grep uses regexes, not globs, with slightly different meanings. In glob, * means 'zero or more characters', in regex, it means 'zero or more of the previous character'.
So something* in regex terms would match something, somethingg, somethingggggggggggggggggggggg, somethin, but not somethina.
In regex, ? means "zero or one of the previous character" while . means "any character". You can combine the two as .? to mean "zero or one of any character" for example.
So try grep 'sample.txt' to match sampleatxt, samplebtxt, samplectxt, etc.
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LEARN ABOUT XFREE86
zgrep
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)