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Full Discussion: Incorrect number of command line arguments and missing required files
Top Forums Shell Programming and Scripting Incorrect number of command line arguments and missing required files Post 302810641 by Ray Sun on Wednesday 22nd of May 2013 08:53:09 AM
Old 05-22-2013
Incorrect number of command line arguments and missing required files
I am developing a script. This script takes in one parameter which is the name of a file whose content is a list of names of some files. The script can check whether those files exist in current directory.
Here is my question:
If the number of provided parameters is less than one or one of the files does not exist in the current directory, I have to print an information error message to standard error and abort the script with non-zero exit status. I know how to check the number of input arguments and whether some files exist in the current directory, but I don't know how to redirect the information error message to stand error. Anyone help?
Here is what I have done so far:
Code:
#!/bin/bash
if [ $# -lt 1 ] ; then #Check there is enough command line parameters.
        exit 1
fi

while read i
do #Check whether there is missing file
        if [ ! -e $i ] ; then
                echo "$i does not exist!"
                exit 1
        fi
done < "$1"
echo "All files exist!"
exit 0

Thanks in advance!
 

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LEARN ABOUT LINUX

service

service(8)						      System Manager's Manual							service(8)

NAME

       service - run a System V init script

SYNOPSIS

       service SCRIPT COMMAND [OPTIONS]

       service --status-all

       service --help | -h | --version

DESCRIPTION

       service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working
       directory set to /.

       The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT.  The  supported  values  of  COMMAND  depend  on  the
       invoked	script,  service  passes  COMMAND and OPTIONS it to the init script unmodified.  All scripts should support at least the start and
       stop commands.  As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the  start
       command.

       service --status-all runs all init scripts, in alphabetical order, with the status command.

EXIT CODES

       service calls the init script and returns the status returned by it.

FILES

       /etc/init.d
	      The directory containing System V init scripts.

ENVIRONMENT

       LANG, TERM
	      The only environment variables passed to the init scripts.

SEE ALSO

       /etc/init.d/skeleton,
       update-rc.d(8),
       init(8),
       invoke-rc.d(8).

								     Jan 2006								service(8)
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