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Top Forums Shell Programming and Scripting Issue with user input including * (glob) and sed Post 303028448 by RudiC on Tuesday 8th of January 2019 09:30:19 AM
Old 01-08-2019
Some thoughts:



*.*.abc as used for grep seems to be a "glob" but should be a regex same as the one used in the sed script (where, BTW, the . is a wildcard char and should be escaped for the extension separator).
Simply using sed on ALL files (leaving them intact if no pattern found) might be more efficient than grepping through all of them, and then using multiple sed invocations again on those with the pattern - depends on the average file length, and the ratio of files with vs. without pattern.
With awk, you could use one single invocation working on an input stream of all files writing to respective individual temporary output files.
 

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GREP(1) 						      General Commands Manual							   GREP(1)

NAME
grep - search a file for a pattern SYNOPSIS
grep [ option ... ] pattern [ file ... ] DESCRIPTION
Grep searches the input files (standard input default) for lines (with newlines excluded) that match the pattern, a regular expression as defined in regexp(6). Normally, each line matching the pattern is `selected', and each selected line is copied to the standard output. The options are -c Print only a count of matching lines. -h Do not print file name tags (headers) with output lines. -i Ignore alphabetic case distinctions. The implementation folds into lower case all letters in the pattern and input before interpre- tation. Matched lines are printed in their original form. -l (ell) Print the names of files with selected lines; don't print the lines. -L Print the names of files with no selected lines; the converse of -l. -n Mark each printed line with its line number counted in its file. -s Produce no output, but return status. -v Reverse: print lines that do not match the pattern. Output lines are tagged by file name when there is more than one input file. (To force this tagging, include /dev/null as a file name argument.) Care should be taken when using the shell metacharacters $*[^|()= and newline in pattern; it is safest to enclose the entire expression in single quotes '...'. SOURCE
/sys/src/cmd/grep.c SEE ALSO
ed(1), awk(1), sed(1), sam(1), regexp(6) DIAGNOSTICS
Exit status is null if any lines are selected, or non-null when no lines are selected or an error occurs. GREP(1)
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