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how can I know the number of tokens in a bash variable (whitespace-separated tokens) - or at least, wether it is one or there are more.
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bash [filename] runs the commands saved in a file. $@ refers to all of a shell script's command-line arguments. $1 , $2 , etc., refer to the first command-line argument, the second command-line argument, etc. Place variables in quotes if the values might have spaces in them.
Use "${#somearray[@]}" to get the number of elements in the array. Beware that first element of an array is ambiguous with ksh and bash as their arrays are space.
There are no Booleans in Bash. However, we can define the shell variable having value as 0 (“ False “) or 1 (“ True “) as per our needs.
'#' symbol can be used to count the length of the string without using any command. `expr` command can be used by two ways to count the length of a string. Without `expr`, `wc` and `awk` command can also be used to count the length of a string.
The $# expansion will tell you the number of elements in a variable / array. If you're working with a bash version greater than 2.05 or so you can:
VAR='some string with words' VAR=( $VAR ) echo ${#VAR[@]} This effectively splits the string into an array along whitespace (which is the default delimiter), and then counts the members of the array.
EDIT:
Of course, this recasts the variable as an array. If you don't want that, use a different variable name or recast the variable back into a string:
VAR="${VAR[*]}" If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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