delete all characters that aren't a letter or number

Shell Programming and Scripting
1

hey :slight_smile:

if i have a variable that is

example=lewisdenny(copywrite symbol)

so its not a nomal letter but a symbol, how can i remove everything in the varible that isnt letter or number thanks :slight_smile:

and as a side little question do you know how to remove .zip from a file like if i

ls /temp
test.zip

how can i remove the .zip and set it as a varable like this?

example=$(ls /temp | grep (command to remove .zip)

thanks

2

Remove numbers and letters

variable=$(printf "$variable" | sed 's/[0-9a-zA-Z]//g')

Remove zip extension

variable=$(printf "$variable" | sed 's/\.zip$//g')
3

You can try % or %%. ${variable%%.*}

4

Not in all shells:

variable=${variable/%\.zip}

---------- Post updated at 11:53 AM ---------- Previous update was at 11:49 AM ----------

What you're looking for:

 example=$(ls /temp | sed 's/\.zip$//')
5

thanks for the answers but im trying to remove everything BUT the letters and numbers :slight_smile:

6

Sorry lad, I was almost sleeping!!! Hahaha

---------- Post updated at 01:09 PM ---------- Previous update was at 12:54 PM ----------

This leaves only the letters and numbers (removes �...):

$ example=lewisdenny�
$ echo $example
lewisdenny�
$ example=$(printf "$example" | sed 's/[^0-9a-zA-Z]//g')
$ echo $example
lewisdenny
1 Like
7

You could also use the POSIX character class "[:alnum:]" like so -

$
$ echo $str
lewisdenny�
$
$ str=$(echo $str | sed 's/[^[:alnum:]]//g')
$
$ echo $str
lewisdenny
$
$

tyler_durden

8

thanks thats just what i wanted :slight_smile: