04-13-2006
change only selected line
hi
i dont know how to go abt this? as i m new to unix.
i have file say as xct. in file there are so many commands.
[ frankly its crontab file]. now here i m accepting new cron settings from user.
but these new settings will be applicable for particular command.
like my file is as
* * * * * read a < /aaadatamart/training/swapneel/util/cronsettings && [ $a -eq 1 ] && ksh /aaadatamart/training/swapneel/util
/hi
* * * * * read a < /aaadatamart/training/swapneel/util/cronsettings && [ $a -eq 2 ] && ksh /aaadatamart/training/swapneel/util
/hi1
* * * * * read a < /aaadatamart/training/swapneel/util/cronsettings && [ $a -eq 3 ] && ksh /aaadatamart/training/swapneel/util
/hi2
Now here first i will ask user choice -- [ say hi2]
then i will ask user abt new minute,date,... cron settings.
then those settings i want to add to this line so my crontab file with the new settings as per the user new input for selected choice [hi2]
plz guide me how go abt this. any logic or atleast any clue?
thanks in advance
regards,
swapneel
here i know how to edit cron file.
crontab < filename.
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CRON(8) System Manager's Manual CRON(8)
NAME
cron - daemon to execute scheduled commands (Vixie Cron)
SYNOPSIS
cron
DESCRIPTION
Cron should be started from /etc/rc or /etc/rc.local. It will return immediately, so you don't need to start it with '&'.
Cron searches /var/spool/cron for crontab files which are named after accounts in /etc/passwd; crontabs found are loaded into memory. Cron
also searches for /etc/crontab and the files in the /etc/cron.d/ directory, which are in a different format (see crontab(5)). Cron then
wakes up every minute, examining all stored crontabs, checking each command to see if it should be run in the current minute. When execut-
ing commands, any output is mailed to the owner of the crontab (or to the user named in the MAILTO environment variable in the crontab, if
such exists).
Additionally, cron checks each minute to see if its spool directory's modtime (or the modtime on /etc/crontab) has changed, and if it has,
cron will then examine the modtime on all crontabs and reload those which have changed. Thus cron need not be restarted whenever a crontab
file is modified. Note that the Crontab(1) command updates the modtime of the spool directory whenever it changes a crontab.
SEE ALSO
crontab(1), crontab(5)
AUTHOR
Paul Vixie <paul@vix.com>
4th Berkeley Distribution 20 December 1993 CRON(8)