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Full Discussion: Grep output problem
Top Forums UNIX for Dummies Questions & Answers Grep output problem Post 302736503 by mattiasvdm on Tuesday 27th of November 2012 11:20:00 AM
Old 11-27-2012
Grep output problem
Hi all,

Here is my problem:

I'm testing a login script for our mac Machines. This script output's in a csv file.

The login script looks like this:

Code:
echo "${computername}|${data1}|${data2}|${data3}" >> file.csv

The csv file looks like this:

Computername1|data1|data2|data3
Computername2|data1|data2|data3
Computername2|data1|data2|data3
Computername2|data1|data2|data3
Computername3|data1|data2|data3

Now I want to erase the data from computername2 because I only want to see the last output from every computernameX.

So before the login script output's the "Computername2|data1|data2|data3" line I want it to erase it's previous output.
When I use
Code:
grep -v Computername2 file.csv > file2.csv

the file2.csv is empty.
When I only use grep (without -v) the file2.csv is similar to file.csv.
When I manually edit the file.csv file en hit enter after all the lines and save the file then it works fine.
So somehow the grep command "sees" only one line. Now I searched the web for all day now but I can't figure out what to do. I think it has something to do with new lines or carriage return.

So what to do? Maybe use another command then grep? Or change the way of output in the login script?
Last edited by mattiasvdm; 11-28-2012 at 05:12 AM.. Reason: added code tag's
 

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GRUB-RENDER-LABEL(1)                                               User Commands                                              GRUB-RENDER-LABEL(1)

NAME

       grub-render-label - generate a .disk_label for Apple Macs.

SYNOPSIS

       grub-render-label [OPTION...] [OPTIONS]

DESCRIPTION

       Render Apple .disk_label.

       -b, --bgcolor=COLOR
              use COLOR for background

       -c, --color=COLOR
              use COLOR for text

       -f, --font=FILE
              use FILE as font (PF2).

       -i, --input=FILE
              read text from FILE.

       -o, --output=FILE
              set output filename. Default is STDOUT

       -t, --text=STRING
              set the label to render

       -v, --verbose
              print verbose messages.

       -?, --help
              give this help list

       --usage
              give a short usage message

       -V, --version
              print program version

       Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

REPORTING BUGS

       Report bugs to <bug-grub@gnu.org>.

SEE ALSO

       The  full  documentation  for grub-render-label is maintained as a Texinfo manual.  If the info and grub-render-label programs are properly
       installed at your site, the command

              info grub-render-label

       should give you access to the complete manual.

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