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Full Discussion: Need Help With My First Borne Shell Program
Top Forums UNIX for Dummies Questions & Answers Need Help With My First Borne Shell Program Post 57645 by FuzzyNips on Thursday 4th of November 2004 12:21:44 AM
Old 11-04-2004
Need Help With My First Borne Shell Program
I'm working on writing my very first borne shell program and I need some help. I think I'm pretty close to having this correct but I may be off. I think my actual program is coded correctly but the commands I use within it I think are what's throwing it off?


**Purpose of the program: To find all files in a directory that contain a given string.


This program runs with only 1 or 2 arguments. The first argument can only consist of upper/lower-case letters. This is the string that you'll be searching for within the directory. If only one command line argument is given you recursively search all files and subdirectories within your current working directory. You then output all files containing the search pattern.

If two arguments are supplied. The first one is still the same as above (the string you're searching for) but the second argument becomes the directory you want to search. Again, I need to output the files that contain the search pattern.

Obviously this involves checking the arguments to make sure they are valid. Argument 1 must be an upper/lower-case letter and argument 2 (if supplied) must be a relative/absolute pathname to an existing directory.


Here's what I have so far:
______________________________________________
Code:
#!/bin/sh

# Checks for valid number of command arguments
if [ $# -eq 0 -o  $# -gt 2 ]; then
        echo "Invalid number of arguments:  1 or 2 only!"
        exit 1
fi

case $# in

"1")  # Checks for validity of command argument 1
        echo $1 | egrep -si "^[a-z]+$"

        # Error message for invalid argument 1
        if [ $? -ne 0 ]; then
                echo "Invalid argument 1:  Letters only!"
                exit 2
        fi

        # Searches through all files in the current working                      
        # directory
        for i in `find . -type f -print`
        do
                # If current file is readable then search for the   
                # string
                if [ -r $i ]; then
                        grep -li "$1 " $i
                fi
        done

"2")  # Checks for validity of command argument 1
        echo $1 | egrep -si "^[a-z]+$"

        # Error message for invalid argument 1
        if [ $? -ne 0 ]; then
                echo "Invalid argument 1:  Letters only!"
                exit 2
        fi

        # Checks for validity of command argument 2
        find $2 -type d

        # Error message for invalid argument 2
        if [ $? -ne 0 ]; then
                echo "Invalid argument 2:  Directory path only!"
                exit 3
        fi

        # Searches through all files in the directory specified
        for i in `find .$2  -type f -print`
        do
                # If current file is readable then search for the         
                # string
                if [ -r $i ]; then
                        grep -li "$1 " $i
                fi
        done;;
esac

exit 0

 

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LEARN ABOUT SUSE

use

USE(1)								   User Commands							    USE(1)

NAME

       use - Frontend to the Usepackage Environment Manager

SYNOPSIS

       csh and derivatives:
	       source /usr/share/usepackage/use.csh

       bourne shell and derivatives:
	       source /usr/share/usepackage/use.bsh

       korn shell:
	       . /usr/share/usepackage/use.ksh

       use [-vs] [-f file] package ...

       use -l

DESCRIPTION

       Usepackage  is an environment management program. It is based on the principle of packages - collections of executables that share a common
       set of necessary environment variables, such as PATH, MANPATH or LD_LIBRARY_PATH.

       For each given package, use sources the appropriate environment information into the current shell.  The environment information is  speci-
       fied in a configuration file, see usepackage(1).

   OPTIONS
       -v     Output verbose information to the standard error stream.

       -s     Silence  warnings  for  un-matched  packages. This is useful in a shell rc script when a package is known not to be available on all
	      architectures that the shell is used on.

       -f file
	      Specify an alternate initial configuration file.

       -l     List available packages and groups.

FILES

       /usr/share/usepackage/usepackage.conf
		      The default configuration file.

       /usr/share/usepackage/use.csh
		      Shell setup for csh and derivatives.

       /usr/share/usepackage/use.bsh
		      Shell setup for bourne shell and derivatives.

       /usr/share/usepackage/use.ksh
		      Shell setup for ksh.

       /usr/bin/usepackage
		      The underlying Usepackage executable.

ENVIRONMENT

       Other than the reading and re-definition of environment variables for package setup, use also uses the following environment variables  for
       user configuration:

       PACKAGES_PATH  Colon-separated  path  list  giving  the directories to search for configuration files. Shell-style tilde (~) user-directory
		      escapes are expanded.

       HOME	      If present in the environment, this is used to provide the expansion for the tilde (~) user-directory.

       SHELL	      If present in the environment, the last path component of this is used for shell matching (see  SYNTAX)  and  detecting  the
		      style of environment output that should be used, see usepackage(1).

COPYRIGHT

       Usepackage Environment Manager
       Copyright (C) 1995-2005	Jonathan Hogg

       This  program  is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by
       the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

       This program is distributed in the hope that it will be useful, but WITHOUT ANY	WARRANTY;  without  even  the  implied	warranty  of  MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

       You  should  have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation,
       Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

SEE ALSO

       usepackage(1), csh(1), sh(1), ksh(1)

Usepackage						   $Date: 2005/12/11 16:42:09 $ 						    USE(1)
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