Shell scripting: String manipulation

[malladisk]

Hi, I'm writing a shell script in which I need to solve this situation:
I have a string:
my_string="some_very_long_string" and I need to replace the last character of this string with a '0'. How can I do that?
And when I run this script, i read this string from the command line parameter so the string length is variable.
Also, is there a link that has useful string manipulation routines for shell scripting?
Thanks,
Sashi

 

[vgersh99]

in ksh [or any POSIX shell]

my_string="${my_string%%?}0"

or with sed:

my_string="echo ${my_string} | sed -e 's/\(.*\).$/\10/g'"

vlad
+----------------------------+
| #include<disclaimer.h> |
+----------------------------+

 

[dickiebird]

Try
newstring=`echo $oldlong_string|sed 's/.$/\0/g'`

Dickie Bird (-)))

 

[malladisk]

THanks a lot, guys!
Sashi