How to loop over directories in Linux using Bash?

How to loop over directories in Linux using Bash?

Another possibility for bash to include hidden directories would be to use: for file in */ ; do if [ [ -d “$file” && ! -L “$file” ]]; then echo “$file is a directory”; fi; done To output only the trailing directory name (A,B,C as questioned) in each solution use this within the loops: Inspired by Boldewyn: Example of loop with find command.

How to loop through file names returned by find?

If find gets a filename with spaces e.g. “the file.txt” you will get 2 separated strings for processing, if you process x in a loop. You can improve this by changing delimiter (bash IFS Variable) e.g. to , but filenames can include control characters – so this is not a (completely) safe method.

How to loop over files with spaces in Linux?

The -0 option splits its input the same way. So this is the combination to use on files with spaces. You can picture this chain of commands as taking every line output by find and sticking it on the end of a chmod command. If the command you want to run as its argument in the middle instead of on the end, you have to be a bit creative.

How big is the for loop in Bash?

Imagine if your command line buffer holds 32KB, and your for loop returns 40KB of text. That last 8KB will be dropped right off your for loop and you’ll never know it.

How to loop through sub directories and copy in a file?

I would like to do this in a loop, as then I am going to try to modify this loop to add some more steps, as ultimately the .txt file is actually a .java file, I am wanting to copy it into each directory, compile it (with the other classes in there), and run it to gather the output. Thanks. Alternatively, you can use the following code.

How to find all the directories in Bash?

You can use pure bash for that, but it’s better to use find: This is done to find both visible and hidden directories within the present working directory, excluding the root directory: to execute multiple commands on the returned values (a very contrived example):

Is there a way to exclude all directories in Bash?

A cleaner version that will include hidden directories and exclude ../ will be with the dotglob shell option in bash: The nullglob shell option makes the pattern disappear completely (instead of remaining unexpanded) if no name matches it.

How to exclude files from the loop in shell script?

Something along the lines of this (untested): While How to exclude some files from the loop in shell script was marked as a dupe of this Q/A and closed, that Q specifically asked about excluding files in a BASH script, which is exactly what I needed (in a script to check the validity of link fragments (the part after #) in local URLs.

How to iterate a list of strings in Bash?

A list of strings or array or sequence of elements can be iterated by using for loop in bash. How you can iterate the list of strings in Bash by for loop is shown in this tutorial by using various bash script examples.

How to loop over files in directory and change path?

It’s a bit trickier if the extensions can vary. You can use finds null separated output option with read to iterate over directory structures safely. will run the while loop in the current scope of the script ( process ) and allow the output of find to be used in setting variables if needed

Are there any Linux distributions that use Bash?

This example can be used any of Linux distribution which uses bash as shell-like Ubuntu, CentOS, RedHat, Fedora, Debian, Kali, Mint, etc. This mechanism is named as for each some programming languages where a list is iterated over.

Where do I find bash script install.sh?

I have a bash script install.sh in my current directory and I have a directory apps which contains multiple directories. I want to loop through these sub directories in app folder and execute some script.

How to loop through all folders and execute script?

I want to loop through these sub directories in app folder and execute some script. After executing script in first folder it should come back and enter into next folder. I have tried this but it’s skipping one after another. I mean it’s entering into all odd folders and not entering into even folders.

How to loop through a list in shell?

The above simple find lists all files from the current directory (including ones with spaces/special-characters). Here, the output of find command is fed to stdin which is parsed by while-loop. You are very close, can’t tell if it is just cut and paste/typos that are causing the issue – note the quotes on line 1 and the $ in line 2.

How to loop through all files in a directory stack overflow?

Collectives on Stack Overflow Find centralized, trusted content and collaborate around the technologies you use most. Learn more Teams Q&A for work Connect and share knowledge within a single location that is structured and easy to search. Learn more Looping through all files in a directory [duplicate]

How to loop through a list of strings in Bash?

Create a bash file named ‘ for_list5.sh ’ with the following code. Here, ‘*’ symbol is used to read all string values of the array. The first for loop is used to display array values in multiple lines and the second for loop is used to display array values in a single line.

How do you split a string into words in Bash?

A string value with spaces is used within for loop. By default, string value is separated by space. For loop will split the string into words and print each word by adding a newline. Create a bash file named ‘ for_list2.sh ’ and add the following script.

How to print a list of strings in Bash?

For loop will split the string into words and print each word by adding a newline. Create a bash file named ‘ for_list2.sh ’ and add the following script. Assign a text into the variable, StringVal and read the value of this variable using for loop.

How to store files in an array in Bash?

And then if you need data about the file, such as size, use the stat command on each file. Here’s a variant that lets you use a regex pattern for initial filtering, change the regex to be get the filtering you desire. Running any shell command inside $ (…) will help to store the output in a variable.

How to store directory files listing into an array?

FYI, I run the script this way: ./bashscript.sh In your version, the while runs in a subshell, the environment variables you modify in the loop are not visible outside it. (Do keep in mind that parsing the output of ls is generally not a good idea at all .) And then if you need data about the file, such as size, use the stat command on each file.

How to read values into an array in Bash?

*Note : Output should be with space between two values so that i can using the values in my further code as looping to fetch another values used NF (Number of field instead of hard coding field numbers). #!/bin/bash # Read the data into the array fields from the # file called “file”.