Menu
Just witting a simple shell script and little confused:
Here is my script:
% for f in $FILES; do echo "Processing $f file.."; done The Command:
ls -la | grep bash produces:
% ls -a | grep bash .bash_from_cshrc .bash_history .bash_profile .bashrc When
FILES=".bash*" I get the same results (different formatting) as ls -a. However when
FILES="*bash*" I get this output:
Processing *bash* file.. This is not the expected output and not what I expect. Am I not allowed to have a wild card at the beginning of the file name? Is the . at the beginning of the file name "special" somehow?
Setting
FILES="bash*" Also does not work.
533
Wildcards do not match hidden files except on UNIX-type platforms when the wildcard pattern starts with a dot character (.).
The syntax to loop through each file individually in a loop is: create a variable (f for file, for example). Then define the data set you want the variable to cycle through. In this case, cycle through all files in the current directory using the * wildcard character (the * wildcard matches everything).
There are three basic loop constructs in Bash scripting, for loop, while loop , and until loop .
The default globbing in bash does not include filenames starting with a . (aka hidden files).
You can change that with
shopt -s dotglob
$ ls -a . .. .a .b .c d e f $ ls * d e f $ shopt -s dotglob $ ls * .a .b .c d e f $ To disable it again, run shopt -u dotglob.
168
If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
Donate Us With
