Regex for "Last Word" of line

[NovaScotian]

I know that a line from diskutil list contains "ACB-External", say, and grep will find that line of the text. What I want is the last word of that line - the node address - something like "disk1s3".

In AppleScript, this works, but uses two do shell script constructions to do it:

do shell script "diskutil mount " & last word of (do shell script "diskutil list | grep ACB-External")

Rather crude. The question: how can I form a regex to find that last word given the name of the disk involved (I want to mount it with diskutil mount), so I can combine those instructions?

[NovaScotian]

Solved

do shell script "diskutil mount `diskutil list | awk '/ ACB-External / {print $NF}'`"

[hayne]

As an alternative to using 'awk', you could use 'grep' with the "-o" option.
E.g.:

diskutil list | grep -o '[^ ]*$'

Explanation of regex:
[^ ] matches any non-space character
[^ ]* matches zero or more non-space characters
The $ anchors it to the end of the line - so it matches zero or more non-space characters at the end of the line.

[Mikey-San]

Quote: Originally Posted by NovaScotian Solved do shell script "diskutil mount `diskutil list | awk '/ ACB-External / {print $NF}'`"

Won't this break if your drive's name has a space in it?

[acme.mail.order]

The final field of `diskutil list` never has spaces ("disk0s3"), so that part should be fine. The awk match can be quoted if necessary.

[Mikey-San]

Ah, yeah, I was thinking of /bin/df.

[NovaScotian]

Thank you, gentlemen; I don't know why RegEx continues to remain so mysterious to me - could be senility, I suppose.

Hayne's form returns all the devices - how do I build in the named one I want, or is this the way:

diskutil list | grep ACB-External | grep -o '[^ ]*$'

which works, but I'm calling grep twice.

[Mikey-San]

Quote: Originally Posted by NovaScotian Thank you, gentlemen; I don't know why RegEx continues to remain so mysterious to me - could be senility, I suppose.

http://www.amazon.com/Mastering-Regu...dp/0596528124/

Best book on the subject, if you're really curious.