WebNov 3, 2016 · I do want to echo to the screen in the function though, so it'll have to be option two. So i tried this: # parameters: $1=name of parameter, $2=user prompt, $3=value read from config.cfg function getParameter { # If the value couldn't be read from the config file if [ -z "$3" ]; then # Echo the prompt echo "$2" # Read the user input read ... WebIf the variable is an empty, you can assign a default value. The syntax is: $ {var:=defaultValue} Example Type the following command at a shell prompt: echo $ …
Set Default Values for Bash Functions Giovanni Benussi Blog
WebJan 5, 2016 · Bash - set default value if a variable is empty; Bash - variables in double quotes vs without quotes; Bash associative array tutorial; Bash check if file begins with a string; Bash shell - check if file or directory exists; Can global variables be modified in bash function? Find memcache request hit rate on linux command line; How to return a ... WebJan 31, 2024 · Setting Arguments with a Default Value. If you want to have default values for function arguments in case their value is not set when calling the function, you can do the following… ${:-} ${1:-test1} # For argument 1 ${2:-test2} # For argument 2 ... ${N:-testN} # For argument N. Let’s go through an example ... the assault movie summary
shell script - Returning a value from a bash function - Unix & Linux ...
WebWhen using the variables, one can make sure that they have a default value set by using "${p_out:-"default value"}" for example. From 3.5.3 Shell Parameter Expansion of the GNU Bash manual: ${parameter:-word} If parameter is unset or null, the expansion of word is substituted. Otherwise, the value of parameter is substituted. WebSep 30, 2024 · If your bash function or a script takes parameters, there's a neat trick to give it a default value: VAR=${1:-DEFAULTVALUE} Sets VAR with the value of first … WebJul 9, 2024 · A function definition in bash needs after the function's name ${1:-Default Message} returns either the content of $1 (if that is given) or the given default value. … the assault objectives