elif
elif is a construct that allows you to add conditions to the else part of an if statement. It is short for “else if” so that a long string of possible actions can be written more concisely. This makes it easier to write, easier to read, and most importantly, easier to debug. A common task for a multi-platform script (such as a generic installer for various different Unixes) is to perform some parts of its task differently depending on the actual operating system it is running on. Without even including any of the actual platform-specific code, this is clearly a mess to read, edit, and debug.
#!/bin/bash OS='uname -s' if [ "$OS" = "FreeBSD" ]; then echo "This Is FreeBSD" else if [ "$OS" = "CYGWIN_NT-5.1" ]; then echo "This is Cygwin" else if [ "$OS" = "SunOS" ]; then echo "This is Solaris" else if [ "$OS" = "Darwin" ]; then echo "This is Mac OSX" else if [ "$OS" = "AIX" ]; then echo "This is AIX" else if [ "$OS" = "Minix" ]; then echo "This is Minix" else if [ "$OS" = "Linux" ]; then echo "This is Linux" else echo "Failed to identify this OS" fi fi fi fi fi fi fi
elif1.sh
By using elif, you can make this much simpler, which not only helps the readability, but makes the script an ...
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