Bash How to set a variable from argument and with a default value
How about this DIR if gt 0 then DIR 1 fi is the number of arguments given to the script and gt means greater than so you basically set DIR to the default value and if the user has specified an argument then you set DIR to that instead Share Improve this answer
Bash command line arguments replacing defaults for variables, 38 I have a script which has several input files generally these are defaults stored in a standard place and called by the script However sometimes it is necessary to run it with changed inputs In the script I currently have say three variables A B and C
How to Use Command Line Arguments in a Bash Script
Using flags is a common way of passing input to a script When passing input to the script there s a flag usually a single letter starting with a hyphen before each argument Let s take a look at the userReg flags sh script which takes three arguments username u age a and full name f
Bash Passing named arguments to shell scripts Unix Linux Stack , 15 Answers Sorted by 271 If you don t mind being limited to single letter argument names i e my script p some path a5 then in bash you could use the built in getopts e g
How can I pass a command line argument into a shell script
How can I pass a command line argument into a shell script , The shell command and any arguments to that command appear as numbered shell variables 0 has the string value of the command itself something like script script home user bin script or whatever Any arguments appear as 1 2 3 and so on The count of arguments is in the shell variable
Interpret Argument With Bash
How to Pass Arguments to a Bash Shell Script Linux Handbook
How to Pass Arguments to a Bash Shell Script Linux Handbook The first bash argument also known as a positional parameter can be accessed within your bash script using the 1 variable So in the count lines sh script you can replace the filename variable with 1 as follows bin bash nlines wc l 1 echo There are nlines lines in 1
What Is Shell Scripting Shell Scripting For Beginner s
1 Answer Sorted by 6 Changing the positional parameters in the function have no affect on the variables as you ve seen Some alternative implementations using parameter substitution Validate foo and bar foo foo default bar bar default using a different parameter substitution with the colon command Bash function that assigns a default value to unset variables. Bash uses a tool called positional parameters to provide a means of entering data into a Bash program when it is invoked from the command line There are ten positional parameters that run from 0 through 9 although there are ways to hack around that limit Starting with a simple script that displays an entered name on the screen 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 argument and if the argument is not set DEFAULTVALUE is used Notice the colon and dash characters Here s a real world example of this feature found in vinit s pro tip
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