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Top Forums UNIX for Beginners Questions & Answers Help with grep to show date/time of file Post 303045374 by newbie_01 on Wednesday 18th of March 2020 04:53:12 PM
Old 03-18-2020
Help with grep to show date/time of file

Hi,


This is similar to what's been asked in the post below:

grep to show date/time of file the string was found in.


The solution sort of work / not work, the problem is if there is no match, then xargs does a full listing. That is if it found file/s that matches the search string and hence file exist, it does list the files but if it doesn't find a match it do a full listing instead Smilie


See example below:


Code:
$: ls -ltr
total 16
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file1
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file2
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file3
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file4
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file5
-rw-r-----   1 tester   omg            15 Mar 19 09:36 corrupt.txt
$: grep -il "bad" * | xargs ls -l
-rw-r-----   1 tester   dba           15 Mar 19 09:36 corrupt.txt
$: grep -il "corrupt" * | xargs ls -l
total 16
-rw-r-----   1 tester   omg            15 Mar 19 09:36 corrupt.txt
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file1
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file2
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file3
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file4
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file5
$: uname -a
SunOS [hostname] 5.11 11.3 sun4v sparc sun4v
$: cat corrupt.txt
BAD FILE FOUND

And just realized I can just actually just do ls -l but it gave me the same behaviour:


Code:
$: ls -l `grep -il "bad" *`
-rw-r-----   1 tester   omg            15 Mar 19 09:36 corrupt.txt
$: ls -l `grep -il "corrupt" *`
total 16
-rw-r-----   1 tester   omg            15 Mar 19 09:36 corrupt.txt
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file1
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file2
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file3
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file4
-rw-r-----   1 tester   omg            0 Mar 19 09:36 file5

I guess this is the expected behavior but kinda hoping it'll just do nothing if it doesn't find any or print something maybe instead? Any suggestion?
 

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LSDIFF(1)							     Man pages								 LSDIFF(1)

NAME
lsdiff - show which files are modified by a patch SYNOPSIS
lsdiff [[-n] | [--line-number]] [[-p n] | [--strip-match=n]] [--strip=n] [--addprefix=PREFIX] [[-s] | [--status]] [[-E] | [--empty-files-as-removed]] [[-i PATTERN] | [--include=PATTERN]] [[-x PATTERN] | [--exclude=PATTERN]] [[-z] | [--decompress]] [[-# RANGE] | [--hunks=RANGE]] [--lines=RANGE] [--files=RANGE] [[-H] | [--with-filename]] [[-h] | [--no-filename]] [[-v] | [--verbose]...] [file...] lsdiff {[--help] | [--version] | [--filter ...] | [--grep ...]} DESCRIPTION
List the files modified by a patch. You can use both unified and context format diffs with this program. OPTIONS
-n, --line-number Display the line number that each patch begins at. If verbose output is requested (using -nv), each hunk of each patch is listed as well. For each file that is modified, a line is generated containing the line number of the beginning of the patch, followed by a Tab character, followed by the name of the file that is modified. If -v is given once, following each of these lines will be one line for each hunk, consisting of a Tab character, the line number that the hunk begins at, another Tab character, the string "Hunk #", and the hunk number (starting at 1). If the -v is given twice in conjunction with -n (i.e. -nvv), the format is slightly different: hunk-level descriptive text is shown after each hunk number, and the --number-files option is enabled. --number-files File numbers are listed, beginning at 1, before each filename. -# RANGE, --hunks=RANGE Only list hunks within the specified RANGE. Hunks are numbered from 1, and the range is a comma-separated list of numbers or "first-last" spans; either the first or the last in the span may be omitted to indicate no limit in that direction. --lines=RANGE Only list hunks that contain lines from the original file that lie within the specified RANGE. Lines are numbered from 1, and the range is a comma-separated list of numbers or "first-last" spans; either the first or the last in the span may be omitted to indicate no limit in that direction. --files=RANGE Only list files indicated by the specified RANGE. Files are numbered from 1 in the order they appear in the patch input, and the range is a comma-separated list of numbers or "first-last" spans; either the first or the last in the span may be omitted to indicate no limit in that direction. -p n, --strip-match=n When matching, ignore the first n components of the pathname. --strip=n Remove the first n components of the pathname before displaying it. --addprefix=PREFIX Prefix the pathname with PREFIX before displaying it. -s, --status Show file additions, modifications and removals. A file addition is indicated by a "+", a removal by a "-", and a modification by a "!". -E, --empty-files-as-removed Treat empty files as absent for the purpose of displaying file additions, modifications and removals. -i PATTERN, --include=PATTERN Include only files matching PATTERN. -x PATTERN, --exclude=PATTERN Exclude files matching PATTERN. -z, --decompress Decompress files with extensions .gz and .bz2. -H, --with-filename Print the name of the patch file containing each patch. -h, --no-filename Suppress the name of the patch file containing each patch. -v, --verbose Verbose output. --help Display a short usage message. --version Display the version number of lsdiff. --filter Behave like filterdiff(1) instead. --grep Behave like grepdiff(1) instead. SEE ALSO
filterdiff(1), grepdiff(1) EXAMPLES
To sort the order of touched files in a patch, you can use: lsdiff patch | sort -u | xargs -rn1 filterdiff patch -i To show only added files in a patch: lsdiff -s patch | grep '^+' | cut -c2- | xargs -rn1 filterdiff patch -i To show the headers of all file hunks: lsdiff -n patch | (while read n file do sed -ne "$n,$(($n+1))p" patch done) AUTHOR
Tim Waugh <twaugh@redhat.com> Package maintainer patchutils 23 Jan 2009 LSDIFF(1)
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