Shell Programming and Scripting

Code:

typeset -i num=$(echo 'Insert completed. No rows added ' | awk '{print $(NF-2)}')

Using the form ... | tr -dc '[:digit:]' works fine for me. The definition for the -c flag is for the complement, i.e. the opposite so it should delete everything except digits.

Can you check your manual page to see if the ic flag is supported?

If you are in bash and the message is always the same format, you could also do this:-

Code:

read a b rows c < <(echo "Insert completed. 100 rows added.")
echo $rows

It only calls echo so avoids the extra process for tr, awk or whatever and doesn't care if you have digits or the text No

You can replace the echo command with whatever command you need to generate the output in the first place.


Does this help?

Robin

Sed alternative:

Code:

echo "Insert completed. 100 rows added" | sed 's/\([^[0-9]*\)\([0-9]*\)\(.*\)/\2/'

Hi.

Also:

Code:

echo "Insert completed. 100 rows added"|sed 's/[^0-9]//g'

producing:

Code:

100

On a system:

Code:

OS, ker|rel, machine: Linux, 3.16.0-4-amd64, x86_64
Distribution        : Debian 8.7 (jessie) 
sed (GNU sed) 4.2.2

Best wishes ... cheers, drl

Try

Code:

print "Insert completed. 100 rows added" | sed 's/[^0-9]//g'

bash / ksh93 / zsh:

Code:

str='Insert completed. 100 rows added'
echo "${str//[!0-9]}"

This also works with recent versions of bash (at least GNU bash, version 3.2.57 and later; but I don't know how far back it appeared in earlier releases).

This form of variable substitutions is an extension that is allowed, but neither required nor explicitly mentioned, by the POSIX standards.