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Full Discussion: How do I separate a portion of a file name to use grep on?
Top Forums UNIX for Beginners Questions & Answers How do I separate a portion of a file name to use grep on? Post 302987025 by steezuschrist96 on Saturday 3rd of December 2016 03:22:41 PM
Old 12-03-2016
How do I separate a portion of a file name to use grep on?
I'm trying to write a script that takes a file name in the form of Name_Num1_Num2.Extension and I want to separate the name portion and then use grep to see if that name part has any illegal characters in it.

I already have my grep command written and it works, I'm not sure how to separate the Name part from the two _Num1_Num2.Extension, is it possible to just look at just the one part of the file name and perform my command on it?

I also want to do the same with the _Num1_Num2 and the .Extension part with my script to check if they contain illegal characters as well, not sure how to approach that as well.

The reason I want to check each part separately is because each part of the file name has different illegal characters where the name cannot contain anything other than letters, digits and then the number portion should only contain digits.

So in short my question is: is there any way I can check portions of filenames? Or is there a better way to approach this? Thanks.

---------- Post updated at 04:22 PM ---------- Previous update was at 04:00 PM ----------

Never mind, I got a solution by doing the following:

Code:
inputFile="name_1_0.cc"
name="${inputFile%_*_*}"
echo $name
name

 

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LEARN ABOUT LINUX

zegrep

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)
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