I have looked for hours for an answer, so I have decided to request your guidance.
I want to substract the first number (series of digits) contained in a string. This string is the output of another command. The substring (number) can be located at any position inside the string.
I want to use only the bash string manipulation facilities, as to avoid using other commands (sed, awk, etc.).
However, it does not state whether "substring" can be a regular expression or not. After trying things like
I reached to the conclusion that substring cannot be a regular expression. Please confirm if this is correct. I know, I learn slow.
Now I found out that this can be solved with a command like
but this is what I wanted to avoid in the first place
So I want to confirm with you guys if there is a way in which I could accomplish this without using external commands.
Thanks a lot, and I hope this post will eventually help others.
Last edited by jcd; 09-05-2008 at 03:27 PM..
Reason: Adding a link to the String Manipulation section of the Advanced Bash-Scripting Guide
I found below script to check whether the variable is a digit in ksh.
############################
#!/bin/ksh
REPLY="3f"
if ]*\)'` != ${REPLY} && "${REPLY}" != "0" ]]
then
print "is digit\n"
else
print "not digit\n"
fi
############################
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