How to escape bash parameter expansion (when a “!” followed by letters is a parameter)

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How to escape bash parameter expansion (when a “!” followed by letters is a parameter)



I have a bash script I need to call with a string parameter, which string starts with a exclamation mark "!" (this is mandatory in what I'm doing):


myCommand.sh "!HELLO"



Because of parameter expansion, bash reports an error:


-bash: !HELLO: event not found



Is there any way to escape the "!" that produces this? Another way to pass such parameter?





Use single quotes: myCommand.sh '!HELLO'
– anubhava
43 secs ago


myCommand.sh '!HELLO'









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