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linux_wiki:use_shell_scripting_to_automate_system_maintenance_tasks [2016/09/21 23:11] billdozor |
linux_wiki:use_shell_scripting_to_automate_system_maintenance_tasks [2019/05/25 23:50] (current) |
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| Review of common shell scripting syntax. | Review of common shell scripting syntax. | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ====== Lab Setup ====== | ||
| + | |||
| + | The following virtual machines will be used: | ||
| + | * server1.example.com (192.168.1.150) -> Create and test some scripts | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ====== Help ====== | ||
| + | |||
| + | Finding help in this section. | ||
| + | * Not many references. Be comfortable with basic bash scripting | ||
| + | * Variables | ||
| + | * Arguments | ||
| + | * Input | ||
| + | * Output | ||
| + | * Decisions (if statements, case) | ||
| + | * Loops | ||
| ---- | ---- | ||
| Line 153: | Line 173: | ||
| echo "The process($1) is no longer running." | echo "The process($1) is no longer running." | ||
| </ | </ | ||
| + | |||
| + | ===== Case Evaluation ===== | ||
| + | |||
| + | Evaluate data and provide matches for expected values. | ||
| + | |||
| + | <code bash> | ||
| + | case $1 in | ||
| + | start) | ||
| + | start_program | ||
| + | ;; | ||
| + | stop) | ||
| + | stop_program | ||
| + | ;; | ||
| + | status) | ||
| + | status_of_program | ||
| + | ;; | ||
| + | *) | ||
| + | echo " | ||
| + | ;; | ||
| + | esac | ||
| + | </ | ||
| + | |||
| + | ---- | ||
| + | |||
| + | ====== Debugging ====== | ||
| + | |||
| + | To debug a script, execute it with a special argument: | ||
| + | <code bash> | ||
| + | bash -x myscript.sh | ||
| + | </ | ||
| + | * -x -> Shows line by line what the script is doing, which allows easier debugging when it breaks | ||
| ---- | ---- | ||