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Full Discussion: A simple query on unix shell script
Top Forums Shell Programming and Scripting A simple query on unix shell script Post 302160951 by strobotta on Wednesday 23rd of January 2008 07:40:12 AM
Old 01-23-2008
possible solution
a possible solution could be:
Code:
#!/bin/bash

if [ -z $1 ]; then
  exit;
fi

current_directory=`pwd`

# 2nd call of the script
if [ "$1" == "$current_directory" ]; then
  ls -l
# first call of the script
else
  cd $1 2>/dev/null
  if [ $? -ne 0 ]; then
    echo "no such directory"
  else
    if [ "${0:0:1}" == "/" ]; then
      $0 `pwd`
    else
      $current_directory/$0 `pwd`
    fi
  fi
fi

This script needs to be called with one argument. That must be a directory name. The script will then change to that directory and do a simple ls -l.

1st check if there is one argument submited (if not quit)
2nd remember the current working directory
3rd check if current woring directory and the target directory (submited in $1) is identical.
- If thats the case, just do an ls -l and then quit.
- If this is not the case, change to the target directory. Check if cd was successfull and then run this script ($0) again with now the current directory as the argument.

The script itself resides still in the old directory (or somewhere else). Therefore a script call with a relative path would fail. So the old path before changing to the target directory must be submited as well to locate the script. If the script was called with an absolute path, $0 can be used without changes (will be located anyway).
You can ommit this problem if you put your script into your $PATH.
 

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LEARN ABOUT OPENSOLARIS

script

script(1)							   User Commands							 script(1)

NAME

       script - make record of a terminal session

SYNOPSIS

       script [-a] [filename]

DESCRIPTION

       The  script  utility  makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the
       record is saved in the file typescript. See WARNINGS.

       The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends
       when the forked shell exits or when Control-d is typed.

OPTIONS

       The following option is supported:

       -a    Appends the session record to filename, rather than overwriting it.

NOTES

       script places everything that appears on the screen in filename, including prompts.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       attributes(5)

WARNINGS

       script  can  pose  a  security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a
       privileged user, that is, root. Be sure that typescript is not a link before running script.

SunOS 5.11							    30 Jan 2004 							 script(1)
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