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Full Discussion: How to read contents of a file from a given line number upto line number again specified by user
Top Forums UNIX for Dummies Questions & Answers How to read contents of a file from a given line number upto line number again specified by user Post 302436782 by grc on Tuesday 13th of July 2010 06:58:31 AM
Old 07-13-2010
How to read contents of a file from a given line number upto line number again specified by user
Hello Everyone.

I am trying to display contains of a file from a specific line to a specific line(let say, from line number 3 to line number 5). For this I got the shell script as shown below:

Code:
if [ $# -eq 3 ]; then
        if [ -e $3 ]; then
            tail +$1 $3 | head -n $2
         else
            echo "$0: Error opening file $3"
            exit 2
        fi
else
        echo "Missing arguments!"
fi

Problem with this code is that it always returns lines from the bottom of the file. I even exchanged the commands head and tail, but of no use. While compiling the above code it shows the following:

Code:
tail: cannot open `+3' for reading: No such file or directory
==> /home/chandran/JONAS/LoveSick <==
It's every day, it's every night
O-oh, call the the doctor
I'm love sick

Can anyone please help me out with the solution.

Thank you.
 

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LEARN ABOUT DEBIAN

mtail

MTAIL(1)							   User Commands							  MTAIL(1)

NAME

       mtail - tail variant designed for web developers monitoring logfiles

SYNOPSIS

       mtail [options]	<file>...

DESCRIPTION

       MonkeyTail  allows  a  user to tail multiple files on both local and remote hosts and clearly marks inactivity by putting 5 newlines in the
       output whenever a pause in output over 3 seconds is detected.

       MonkeyTail is implemented a fairly simple wrapper script around standard tail, ssh, and sudo.

OPTIONS

       -q     Quiet mode

       --quiet
	      "    "

       -n     Output the last N lines of each file before tailing (defaults to 0)

       <file>...
	      Files to tail.

	      These can specified in the following ways:

       @<groupname>
	      - expands the group (from .mtailrc) to a list of

	      files to tail

       <filename>
	      - tails a local file.

       +<filename>		- attempts to sudo and tail a local file (will
	      prompt for pwd if required).

       <remotehost>:<filename>
	      - attempts to invoke tail via ssh on a remote

	      host.

       +<remotehost>:<filename> - attempts to invoke sudo tail via ssh on a
	      remote host (will prompt for pwd if required).

SEE ALSO

       mtailrc(5), tail(1)

AUTHOR

       Martyn Smith <martyn@dollyfish.net.nz>

mtail								     May 2008								  MTAIL(1)
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