Mastering Linux Shell Scripting - Second Edition

More conditions with elif

Moving on to where we require a greater degree of control, we can use the elif keyword. Unlike else, elif requires an additional condition to be tested for each elif. In this way, we can provide for different circumstances. We can add in as many elif conditions as required. The following shows some pseudocode:

if condition; then 
statement 
elif condition; then 
statement 
else 
statement 
fi 
exit 0 

A script may make life easier for the operator by providing a simplified selection for a more complex piece of code. Even though the script becomes gradually more complex to meet the requirements, to the operator the execution is greatly simplified. It is our job to enable users to run more complex operations easily from the ...