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Full Discussion: Will not work on execute...
Top Forums UNIX for Dummies Questions & Answers Will not work on execute... Post 302233767 by jim mcnamara on Monday 8th of September 2008 11:36:52 AM
Old 09-08-2008
ok.

when you write a script, then execute it, the script runs as a child process. Any changes you make to the environment (variables are part of the environment) are made to the child's envrionment. When the child exits at the end of the script, you revert back to the parent environment. All child changes are lost.

<dot space>script.sh - means runs this in the parent envrionment. This is called sourcing. bash supports a builtin function, source, which is the same as the dot thing.
When you source some script, environment changes are kept in the same process, the parent. .bashrc or .profile are run when you login - they are sourced.
 

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service(8)						      System Manager's Manual							service(8)

NAME
service - run a System V init script SYNOPSIS
service SCRIPT COMMAND [OPTIONS] service --status-all service --help | -h | --version DESCRIPTION
service runs a System V init script in as predictable environment as possible, removing most environment variables and with current working directory set to /. The SCRIPT parameter specifies a System V init script, located in /etc/init.d/SCRIPT. The supported values of COMMAND depend on the invoked script, service passes COMMAND and OPTIONS it to the init script unmodified. All scripts should support at least the start and stop commands. As a special case, if COMMAND is --full-restart, the script is run twice, first with the stop command, then with the start command. service --status-all runs all init scripts, in alphabetical order, with the status command. If the init script file does not exist, the script tries to use legacy actions. If there is no suitable legacy action found and COMMAND is one of actions specified in LSB Core Specification, input is redirected to the systemctl. Otherwise the command fails with return code 2. FILES
/etc/init.d The directory containing System V init scripts. ENVIRONMENT
LANG, TERM The only environment variables passed to the init scripts. SEE ALSO
chkconfig(8), ntsysv(8), systemd(1), systemctl(8), systemd.service(5) Jan 2006 service(8)
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