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Top Forums Shell Programming and Scripting Can help me explain this script? Post 302309146 by cfajohnson on Tuesday 21st of April 2009 08:15:35 AM
Old 04-21-2009
Quote:
Originally Posted by vincyoxy
Hi expert
Can help me explain this script?

Code:
 
myFile="./File"
myCell=""
while [ 1 ]


An infinite loop, usually written as:

Code:
while :

Quote:
Code:
do
        read myCell || break


If nothing is entered, break out of the loop.
Quote:
Code:
        echo ""
        echo "***************************"
        echo "$myCell"
        echo "***************************"
done < $myFile

this is ksh.

It is a plain vanilla, but strangely coded, Bourne shell script.

More natural is:
Code:
while IFS= read -r myCell
do
    echo ""
    echo "***************************"
    echo "$myCell"
    echo "***************************"
done

Quote:

Can help me change it into csh?

No.

Top Ten Reasons not to use the C shell
Csh problems
Csh Programming Considered Harmful
 

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ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
September 27, 2014 BSD
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