command substitution within contrab question
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From: Ant on 30 Jun 2010 00:07 G'day The following line from crontab 45 13 * * * /usr/bin/cp /export/home/cckell/scratch /export/home/cckell/scratch.`/usr/bin/date '+\%A'` Produces this output ... -rw-r--r-- 1 ccakell7 ndbaadm 17768 Jun 30 13:19 scratch.\Wednesday It adds a \ before the Day. What i want it to produce is ... scratch.Wednesday The \ is necessary to escape the %, but I did not expect it to appear in the output. Any suggestions appreciated. Tony
From: Barry Margolin on 30 Jun 2010 00:24 In article <i0efth$ei2$1(a)air.soe.uq.edu.au>, Ant <ant(a)example.com> wrote: > G'day > > The following line from crontab > > 45 13 * * * /usr/bin/cp /export/home/cckell/scratch > /export/home/cckell/scratch.`/usr/bin/date '+\%A'` > > Produces this output ... > > -rw-r--r-- 1 ccakell7 ndbaadm 17768 Jun 30 13:19 scratch.\Wednesday > > > It adds a \ before the Day. > > What i want it to produce is ... > > scratch.Wednesday > > The \ is necessary to escape the %, but I did not expect it to appear in > the output. > > Any suggestions appreciated. What OS? I remember seeing this bug about 20 years ago on Solaris. If your cron implementation still has this bug, then the solution is to put the commands in a script rather than writing it out in the crontab. -- Barry Margolin, barmar(a)alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group ***
From: Ant on 30 Jun 2010 00:40 Barry Margolin wrote: > In article <i0efth$ei2$1(a)air.soe.uq.edu.au>, Ant <ant(a)example.com> > wrote: > >> G'day >> >> The following line from crontab >> >> 45 13 * * * /usr/bin/cp /export/home/cckell/scratch >> /export/home/cckell/scratch.`/usr/bin/date '+\%A'` >> >> Produces this output ... >> >> -rw-r--r-- 1 ccakell7 ndbaadm 17768 Jun 30 13:19 scratch.\Wednesday >> >> >> It adds a \ before the Day. >> >> What i want it to produce is ... >> >> scratch.Wednesday >> >> The \ is necessary to escape the %, but I did not expect it to appear in >> the output. >> >> Any suggestions appreciated. > > What OS? I remember seeing this bug about 20 years ago on Solaris. > > If your cron implementation still has this bug, then the solution is to > put the commands in a script rather than writing it out in the crontab. > OS is Solaris 10 > more /etc/release Solaris 10 11/06 s10s_u3wos_10 SPARC Copyright 2006 Sun Microsystems, Inc. All Rights Reserved. Use is subject to license terms. Assembled 14 November 2006
From: Glenn Jackman on 5 Jul 2010 12:11 At 2010-06-30 12:07AM, "Ant" wrote: > G'day > > The following line from crontab > > 45 13 * * * /usr/bin/cp /export/home/cckell/scratch > /export/home/cckell/scratch.`/usr/bin/date '+\%A'` [...] > The \ is necessary to escape the %, but I did not expect it to appear in > the output. Try double quotes instead of single quotes. -- Glenn Jackman Write a wise saying and your name will live forever. -- Anonymous
From: Barry Margolin on 5 Jul 2010 21:16
In article <slrni3411t.ll4.glennj(a)smeagol.ncf.ca>, Glenn Jackman <glennj(a)ncf.ca> wrote: > At 2010-06-30 12:07AM, "Ant" wrote: > > G'day > > > > The following line from crontab > > > > 45 13 * * * /usr/bin/cp /export/home/cckell/scratch > > /export/home/cckell/scratch.`/usr/bin/date '+\%A'` > [...] > > The \ is necessary to escape the %, but I did not expect it to appear in > > the output. > > Try double quotes instead of single quotes. Why do you think that will make a difference? The only difference between single and double quotes is when the string contains variable, arithmetic, or command substitutions. -- Barry Margolin, barmar(a)alum.mit.edu Arlington, MA *** PLEASE post questions in newsgroups, not directly to me *** *** PLEASE don't copy me on replies, I'll read them in the group *** |