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I want to something like this in bash:
alias foo='bar="$(echo hello world | grep \"hello world\")"; echo $bar;'; foo
Expected output: hello world
Ouput: grep: world": No such file or directory
The outer quotes have to be single quotes, with double quotes $bar would be empty.
The next quotes have to be double quotes, with single quotes $() wouldn't expand.
The inner quotes could be both type of quotes, but single quotes doesn't allow single quotes inside of them.
How to I achieve this?
709
Single quotes(') and backslash(\) are used to escape double quotes in bash shell script. We all know that inside single quotes, all special characters are ignored by the shell, so you can use double quotes inside it. You can also use a backslash to escape double quotes.
Use single quotes for a nested quotation, when someone repeats what someone else said. Joe smiled and said, "Jenny said 'yes' when I asked her to marry me." If you need another layer of quotation, just keep alternating between single and double quotation marks.
3.1.2.3 Double Quotes Enclosing characters in double quotes (' " ') preserves the literal value of all characters within the quotes, with the exception of ' $ ', ' ` ', ' \ ', and, when history expansion is enabled, ' ! '. When the shell is in POSIX mode (see Bash POSIX Mode), the ' !
bash [filename] runs the commands saved in a file. $@ refers to all of a shell script's command-line arguments. $1 , $2 , etc., refer to the first command-line argument, the second command-line argument, etc. Place variables in quotes if the values might have spaces in them.
The stuff inside $() represents a subshell, so you are allowed to place un-escaped double quotes inside
alias foo='bar="$(echo testing hello world | grep "hello world")"; echo "$bar"'
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