_upword() #@ USAGE: upword STRING { local word=$1 while [ -n "$word" ] ## loop until nothing is left in $word do to_upper "$word" _UPWORD=$_UPWORD$_UPR word=${word#?} ## remove the first character from $word done } upword() { _upword "$@" printf "%s\n" "$_UP...
In Bash scripting, thewhileloop functions by repeating a set of instructions as long as the specified condition is true. Typically, the while loop is preferred where the number of iterations is uncertain or variable. In this guide, I will explore theBash while loop, its syntax, and usage t...
In this form, the for statement executes the command enclosed in a body, once for each item in the list. The current item from the list will be stored in a variable “varname” each time through the loop. This varname can be processed in the body of the loop. This list can be a ...
When not present, the for-loop will use the $@ variable and will iterate over each positional parameters, similar to for name in "$@". # For-loop syntax (foreach or range) for name [ [in [words …] ] ; ] do commands done # Examples [me@linux ~]$ for os in linux mac ...
For loop will split the string into words and print each word by adding a newline. #!/bin/bash # Read a string with spaces using for loop for value in I like programming do echo $value done Output: $ bash for_list1.sh Example-2: Iterating a string variable using for loop Create ...
In the script, thecatcommand is executed using command substitution. The output ofcat file1.txtreplaces the command, and theforloop iterates through the command’s output and prints it to the standard output using theprintfcommand. #!/bin/bashprintf"Program prints the lines of a file\n\n...
# I put a variable in my scripts named PROGNAME which # holds the name of the program being run. You can get this # value from the first item on the command line ($0). # Reference: This was copied from <http://www.linuxcommand.org/wss0150.php> ...
In this example, we have two arrays:fruitsandcolors. We use a ‘for’ loop to iterate through the indices of thefruitsarray (obtained using the!symbol before the array variable). For each iteration, we print out a sentence that combines elements from both arrays at the same index. ...
Use While Loop in Bash While running bash scripts, you'll come across times when you want to run tasks repeatedly such as printing the value of a variable in a specific pattern multiple times. In this tutorial, I'm going to walk you through the following: ...
inputvar2=$var2# Variable assigned to itself[ x$var= xval ]# Antiquated x-comparisonsls() { ls -l"$@"; }# Infinitely recursive wrapperaliasls='ls -l'; ls foo# Alias used before it takes effectforx;doforx;do# Nested loop uses same variablewhilegetopts"a"f;docase$fin"b")# ...