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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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XFMTYPE(1)								XFM								XFMTYPE(1)

NAME
xfmtype - xfm file type tester SYNOPSIS
xfmtype -m magic_file [-f] filename ... DESCRIPTION
The xfmtype program reads a magic configuration file and tests each file in its command line to tell its type according to the configura- tion file. The format of the configuration file is the similar to magic(5) with the differences described in 0 OPTIONS
-f file Consider the following argument as a file, even if it begins with `-'. -m file Specifies a configuration file. You can specify more than one configuration file with several -m flags. They are read in the order in which they are found. Configuration files do not have effect until they are encountered in the command line. So, files to test in the command line before that switch will not be affected by it. BUILT IN TYPES
If no rule matches a specified field or the type cannot be determined because of other reasons, one of the following built in types is returned: inode/x-unreadable The file could not be read. inode/x-empty File size is zero. text/plain The file looks like ACSII. xfm will look into xfm_mime.type(5) for more guessing. application/octet-stream Other regular file. xfm will look into xfm_mime.type(5) for more guessing. inode/directory A directory. inode/chardevice A character device. inode/blockdevice A block device. inode/pipe A names pipe (fifo). inode/socket A socket. inode/default None of the above. BUGS
Bad configuration lines cause undefined behavior. In general they are silently ignored, but that is not guaranteed. There are no warning or error message except for the regular expression syntax. There should be a syntax checking mode. All of the above apply to xfm too. SEE ALSO
xfm(1), xfm_magic(5), file(1), magic(5). COPYRIGHT
Copyright (c) 1995 CNM-US Copyright (c) 1995 Juan D. Martin AUTHOR
Juan D. Martin (juando@cnm.us.es) (but modified heavily by Bernhard R. Link) xfm 20 April, 2006 XFMTYPE(1)
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