else

Use else in bash script

$ if [condition]; then echo "true"; else echo "false"; fi

$ if [ $x -lt 0 ]; then echo "negative"; elif [ $x -eq 0 ]; then echo "zero"; else echo "positive"; fi

if condition; then commands; else commands; fi

else is a shell keyword providing an alternative branch in conditional statements. It executes when the preceding if (and any elif) conditions are false.
else appears after if/elif blocks and before fi. It cannot have a condition - it catches all remaining cases. Only one else block is allowed per if statement.
This is a fundamental shell scripting construct for handling the "otherwise" case in conditional logic.

Shell keyword, not standalone command. Must be within if/fi block. Cannot have condition. Only one else per if statement.

else is part of POSIX shell syntax from the Bourne shell, created by Stephen Bourne at Bell Labs. It provides the standard fallback mechanism in shell conditional statements.

if(1), elif(1), test(1), bash(1)