2. Changing Command-Line Arguments Command-line arguments are values passed to a script or command when it’s executed. In Bash, these arguments are accessible through the special variables$1,$2,$3, up to$9. In this case,$1represents the first argument,$2represents the second argument, an...
For example: echo "Hello $1" 1. Run: ./script.sh Wan 1. It printHello Wan. Example Create a empty project init-js.sh echo "Initializing JS project at $(pwd)" git init npm init -y # create package.json with all the defaults mkdir src touch src/index.js code . # open src/inde...
4. Using a Loop to Count Arguments 5. Using Conditional Expression 6. Using Case Statement 7. Using Functions for Argument Validation 8. Conclusion 1. Overview In Bash scripting, it’s often necessary to verify the number of arguments passed to a script to ensure correct script execution. Thi...
Case Statements In Bash For Loop In Bash While & Until Loops Bash Select Loop Functions In Bash Indexed Array Associative Array Bash declare Command Usage With Examples Heredoc In Bash Getopts - Create script to parse command line arguments Handling Date and Time in Bash Script How To Parse CSV...
#!/bin/bash echo Script name: $0 echo $# arguments if [$# -ne 1]; then echo "illegal number of parameters" fi For some unknown reason I've got the following error: test: line 4: [2: command not found What am I doing wrong? bash parameter-passing command-line-arguments Share ...
# Shebang line: Indicates the path to the shell interpreter (in this case, bash) # Print the name of the script echo "Name of the script: $0" # Print the number of arguments passed to the script echo "Number of arguments passed: $#" ...
VALID_ARGUMENTS=$## Returns the count of arguments that are in short or long optionsif["$VALID_ARGUMENTS"-eq 0 ];thenhelpfievalset--"$OPTS"while:docase"$1"in-c | --city1 ) city1="$2"shift2 ;; -d | --city2 ) city2="$2"shift2 ...
$ cat flag-positional-param.sh while getopts u:a:f: flag do case "${flag}" in u) username=${OPTARG};; a) age=${OPTARG};; f) fullname=${OPTARG};; esac done # Now handle positional arguments shift $((OPTIND - 1)) param1=$1 # First positional argument param2=$2 # Second ...
Command line arguments can be read in Bash Scripting by using the special variables "$1", "$2", "$3", etc. to access each argument in order. If you use two command line arguments, $2 will be the second argument. How to perform conditional tests in Bash Scripting?
As always, begin with the shebang line: #!/bin/bash Before you call mkdir, check for an empty first argument (i.e. no arguments). You can do this using Bash's if statement which runs code based on a condition: if["$1"=""];then ...