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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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BLAS-TEST(1)						     Linux Programmer's Manual						      BLAS-TEST(1)

NAME
x{s,d,c,z}c?blat{1,2,3} - testing programs for blas SYNOPSIS
x{s,d,c,z}c?blat1 x{s,d,c,z}c?blat{2,3} < parameter file DESCRIPTION
This manual page documents briefly the blas testing programs. This manual page was written for the Debian GNU/Linux distribution because the original programs do not have manual pages. blas is a library of Basic Linear Algebra routines, accessed through either a Fortran and/or a C interface. These routines are categorized into three levels: level1 referring to vecotr-vector operations, level2 to matrix-vector operations, and level3 to matrix-matrix opera- tions. In addition, all routines are written in four "precisions", single precision real (s), double precision real (d), cingle precision complex (c), and double precision complex (z). The testing binaries examine routines in the level indicated by the last character in the program name and in the precision indicated by the second character in the program name. The stem "blat" in the program name refers to a Fortran interface tester, whereas a "cblat" stem refers to a C interface tester. The test programs for levels 2 and 3 read a set of parameters specifying the problem ranges to examine on standard input. Sample input files are found in /usr/share/doc/blas-test/examples. Files of the form {s,d,c,z}in{2,3} are input files for the C interface testing pro- grams, while files or the form {s,d,c,z}blat{2,3}d are input files to the Fortran testing programs. On Debian systems, these programs are dynamically linked against the blas library. This enables the user to test and compare alternate versions of the library, such as those provided by atlas, through the use of the LD_LIBRARY_PATH and LD_PRELOAD environment variables. One can confirm the versions of the libraries being tested in a given environment with the aid of the ldd program. OPTIONS
These programs take no command line options. AUTHOR
This manual page was written by Camm Maguire <camm@enhanced.com>, for the Debian GNU/Linux system (but may be used by others). netlib January 29, 2002 BLAS-TEST(1)
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