shell assignment 2

Write a shell script to locate executable files. This script takes a list of file names from the command line

and determines which would be executed had these names been given as commands.

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  • Please refer the Syllabus for the Assignment / Project Requirements and Guidelines
  • The search path should be based only on the user’s PATH environment variable. You shall not use the
  • Unix which command, the ksh whence (type) command, the locate command, or the bash type command.

  • The code for the script shall not use the UNIX ls command to determine if the file is executable or if it
  • exists.

  • The script should find only the first occurrence of the “file”. If the file is not found, the script the following
  • <command> NOT FOUND

    <command> would be replaced by the name of the “file” you didn’t find.

  • If the first parameter is ‘-a’, then the script should print all occurrences of the executable file in the user’s
  • path. Again, if the file was not on the path, an error message should be displayed.

  • The find command shall not be used.
  • A project using temporary files will not be graded.
  • NOTE: The shell variable PATH defines the search path for the directory containing the command.
  • Alternative directory names are separated by a colon (:). The current directory can be specified by two or

    more adjacent colons, or by a colon at the beginning or end of the path list.

  • If the command name contains a / then the search path is not used, you just check if the command/file
  • specified is executable and not a directory. Otherwise, each directory in the path is searched for an

    executable file.