If Condition Types in Bash

Multi Line:

if [[ $INSTALLED != "yes" ]]; then echo "Error message." fi
Code language: Bash (bash)
if [[ $INSTALLED != "yes" ]]; then echo "Error message." else echo "Message." fi
Code language: Bash (bash)

One Line:

if [[ $INSTALLED != "yes" ]];then echo "Error message."; fi
Code language: Bash (bash)
if [[ $INSTALLED != "yes" ]];then echo "Error message."; else echo "Message."; fi
Code language: Bash (bash)

Another One Line Method:

[[ $INSTALLED != "yes" ]] && echo "Error message." || sleep 0
Code language: Bash (bash)
[[ $INSTALLED != "yes" ]] && echo "Error message." || echo "Message."
Code language: Bash (bash)

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