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nixCraft - Use bash 4.x parameter expansion to convert string on a Linux/Unix/macOS/*BSD: var="This is a test" echo "${var~~}" # Reverse var # echo "${var^^}" # UPPERCASE var # echo "${var,,}" #
Bash Assign Output of Shell Command To Variable - nixCraft
![nixCraft on Twitter: "Check if a variable is set in Bash or not script on Linux or macOS/Unix: portable version: [ -z ${VAR+y} ] && echo "\${VAR} not defined" bash v4.2 only (](https://pbs.twimg.com/media/Es5g92nUcAA7KUe.png "nixCraft on Twitter: \"Check if a variable is set in Bash or not script on Linux or macOS/Unix: portable version: [ -z ${VAR+y} ] && echo \"\${VAR} not defined\" bash v4.2 only (")
nixCraft on Twitter: "Check if a variable is set in Bash or not script on Linux or macOS/Unix: portable version: [ -z ${VAR+y} ] && echo "\${VAR} not defined" bash v4.2 only (
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nixCraft en Twitter: "Here is how to do indirect/reference variables in Bash under Linux or Unix: echo "${!ref_name}" # Define a new 'var' var="Foo Bar" # Set reference to variable named 'var'
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Phoenix Song Echo #1 Yu Var: Rebecca Roanhorse: Amazon.com: Books
![Solved #!/bin/bash if [ $# -lt 2 ] then echo "error A" exit | Chegg.com](https://media.cheggcdn.com/media/881/88137e30-787b-48f5-a3c2-964ef0f3deeb/phpxrNXbk.png "Solved #!/bin/bash if [ $# -lt 2 ] then echo \"error A\" exit | Chegg.com")
Solved #!/bin/bash if [ $# -lt 2 ] then echo "error A" exit | Chegg.com
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