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Full Discussion: grep not accepting variable filename
Top Forums Shell Programming and Scripting grep not accepting variable filename Post 302498207 by bdrelling on Sunday 20th of February 2011 01:09:15 PM
Old 02-20-2011
grep not accepting variable filename
I have a very basic shell script right now, and I am trying to run grep from inside of it. It looks like this:

Code:
#!/bin/sh
filename=$1
echo "The program that you will be editing is called $filename"
grep "//" $filename

The name of said file is "myscript" for right now. I am executing it on the command line as follows:

Code:
sh myscript test.txt

It SHOULD output the first three lines of the text file, since they are preceded with // style comments, which is what I am looking for. It should look like the following:

Code:
// Some text
// Some more text
// Some more text

I know it should look like that because when I run
Code:
grep "//" test.txt

outside of the script, it displays. From inside the script, I get this error:

Code:
The program that you will be editing is called test.txt
grep: can't open test.txt

I'm not sure what I'm doing wrong... I also want to mention that when I put "test.txt" inside the script instead of "$filename", it runs perfectly, so I KNOW it has to be with the variable, but what is it that I messed up?

For added information, the primary shell is tcsh and the shell I am trying to run the script in is sh, if that makes a difference.


Thanks in advance.
 

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LEARN ABOUT PLAN9

zgrep

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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