Inter-debugging of Perl shell scripts

1 shell echo command will automatically add line breaks

2. $? Accept exit return values

3. The variable is equal to 'execute script', and the obtained value of the variable is the value output from the script to stdout.

Example:

1. Perl calls Shell

1. Contents in SH

#! /Usr/bin/sh
Echo 'date ';
Exit 1;

Content in test. pl

1 use strict;

2 Use warnings;
3 my $ S = 'sh 1. Sh ';
4 print stdout "$ s ";
5 my $ exitcode =$?> 8;
6 print "$ exitcode \ n ";

 

2 shell calls Perl

Shell script instance

#! /Usr/bin/sh
S = 'perl prepareenvironment. pl'
Echo $ ?;
Echo $ S;

 

3. The system command in Perl cannot execute system ("cd xxx ");

Ln-SF $ S/Good. DIC ../DIC/Good. DIC ln command when creating a soft connection, the first parameter must be an absolute path

Touch a.txt. When a.txt exists, touch only changes the time stamp of the file.