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Shell Programming and Scripting

Execute the first line from last

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Top Forums Shell Programming and Scripting Execute the first line from last
# 8  
Old 06-18-2010
Hi Scrutinizer,
I just tried your method to check what happens, and I am receiving this.

Code:
$ echo " 1  1 * * *  /path/to/abc.sh PB
 2  1 * * *  /path/to/abc.sh RA
 3  1 * * *  /path/to/abc.sh GS
 4  1 * * *  /path/to/abc.sh S
 5  1 * * *  /path/to/abc.sh SI
 6  1 * * *  /path/to/abc.sh DR
26  4 * * *  /path/to/abc.sh CT
26  6 * * *  /path/to/abc.sh DL
27  6 * * *  /path/to/abc.sh DE" | crontab
crontab: usage error: file name must be specified for replace
usage:  crontab [-u user] file
        crontab [-u user] [ -e | -l | -r ]
                (default operation is replace, per 1003.2)
        -e      (edit user's crontab)
        -l      (list user's crontab)
        -r      (delete user's crontab)
$

Is there something wrong which I am doing?
Code:
$ uname
CYGWIN_NT-5.1
$

# 9  
Old 06-18-2010
I think your particular crontab cannot read from stdin. Just redirect the echo to a temporary file and then use:
Code:
crontab tmpfile

This User Gave Thanks to Scrutinizer For This Post:
clx
# 10  
Old 06-18-2010
ok.
Yes this worked.
Thank you.

I just looked at the man page for the possible options and found.
like usual way, in my crontab I need to provide "-" if the input is stdin.

Code:
SYNOPSIS
       crontab [-u user] file


       The  first  form  of  this command is used to install a new crontab from some named file or standard input if the
       pseudo-filename ``-'' is given.

So, this worked for me.
Code:
$ echo " 1  1 * * *  /path/to/abc.sh PB
 2  1 * * *  /path/to/abc.sh RA
 3  1 * * *  /path/to/abc.sh GS
 4  1 * * *  /path/to/abc.sh S
 5  1 * * *  /path/to/abc.sh SI
 6  1 * * *  /path/to/abc.sh DR
26  4 * * *  /path/to/abc.sh CT
26  6 * * *  /path/to/abc.sh DL
27  6 * * *  /path/to/abc.sh DE" | crontab -
$

Thanks a lot for the info.
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