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--- linux_wiki:use_shell_scripting_to_automate_system_maintenance_tasks [2016/09/21 22:58]
billdozor created
+++ linux_wiki:use_shell_scripting_to_automate_system_maintenance_tasks [2019/05/25 23:50]
@@ Line 1: / Line 1: @@
-====== Use Shell Scripting To Automate System Maintenance Tasks ======
-**General Information**
-Review of common shell scripting syntax.
-----
-====== General Layout ======
-General bash script layout
-<code bash>
-#!/bin/bash
-echo "Hello world"
-exit 0
-</code>
-----
-====== Arguments ======
-Sending and parsing arguments to scripts.
-<code bash>
-#!/bin/bash
-echo "The first argument is: $1"
-echo "The second argument is: $2"
-echo "There are $# total arguments."
-echo "All of the arguments are: $@"
-# Loop through arguments one at a time
-for myarg in $@; do
-  echo "Argument is: $myarg"
-done
-</code>
-----
-====== Getting User Input ======
-User input with the read command
-<code bash>
-#!/bin/bash
-# If there is no argument passed, prompt for input
-if [ -z $1 ]; then
-  echo "Enter something: "
-  read myname
-else
-  # There is an argument, use that
-  myname=$1
-fi
-echo "You entered: $myname"
-exit 0
-</code>
-----
-====== Conditionals ======
-If/else conditional testing
-<code bash>
-if [ -f $1 ]; then
-  echo "Argument is a file"
-elif [ -d $1 ]; then
-  echo "Argument is a directory"
-else
-  echo "Argument is something else..."
-fi
-exit 0
-</code>
-\\
-Logical operators
-<code bash>
-# Logical AND: If first command is true, execute second command
-[ -f $1 ] && echo "This is a file"
-# Logical OR: If first command is true, do not execute second command
-[ -f $1 ] || echo "This is not a file"
-</code>
-----