Reasons for shell scripts not using source in ubuntu12.04 and solutions

Phenomenon: Prompt source:not found when source aaa.sh in shell script

Reason: Ls-l ' which sh ' hint/bin/sh-> dash

This means that the dash is used to parse.

Change Back method:

Command line execution: sudo dpkg-reconfigure dash

Select No in the interface

Again ls-l ' which SH ' hint/bin/sh-> bash

The modification succeeds, source can use ~

Description

The Dash shell is a Unix shell that is much smaller than the bash shell and is compliant with POSIX standards. Debian used/bin/bash change/bin/dash to use less disk space, provide less functionality, and get faster speeds. But then there was a run problem with the shell script test. Because of the shell script (shell scripts) that could have been run under the bash shell, there were some unexpected problems, not 100% concurrent. Ubuntu inherits Debian, so the default is the dash Shell, starting with Ubuntu 6.10. WORKAROUND: Reconfigure Shell 1. sudo dpkg-reconfigure Dash chooses No and does not use the dash Shell. 2. Use link point ln-s/bin/bash/bin/sh check is correct: ls-l/bin/sh