On 12/27/10, Rodolfo Alcazar Portillo <nospaze@xxxxxxxxx> wrote: > Hello. See this: > > # A="echo 'hi'" > > # echo $($A) > 'hi' > > # echo 'hi' > hi > > Does anyone understand why does the first command > evals the echo but echoes the simple quotes? > > Is there any dark shopt option which makes it run correctly? > > Thanks... > ---------------------------------------------- > Rodolfo Alcazar Portillo - nospaze@xxxxxxxxx > otbits.blogspot.com / counter.li.org: #367962 > ---------------------------------------------- > # unzip; strip; touch; finger; grep; mount; fsck; more; yes; fsck; fsck; > fsck; umount; sleep > > I will do the short explanation This expression does what I call Double expansion echo $($A) First it expands echo HI Then it does the echo which yields HI In your second command echo 'hi' It just echos hi .. like it should Sorry, if this doesn't sound real elegant.. Someone will give a better description HTH Marvin J. Kosmal Disclaimer: This email is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of Farmer Marvin or any of the hens. -- users mailing list users@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe or change subscription options: https://admin.fedoraproject.org/mailman/listinfo/users Guidelines: http://fedoraproject.org/wiki/Mailing_list_guidelines
