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# 1  
Old 12-28-2010
sed question
Hi,

I am trying to write a script which will do the following:

1. edit the cron entries for specific scripts.
2. comment out the cron entries
3. make them out of schedule.
4. do some other operation.
4. remove the comments from crontab.
5. reschedule the scripts.

I believe we can use 'sed' statement to do this entire operation in one line, but i am a beginner in sed.

Please let me know if you have any ideas on this.

-Sam
# 2  
Old 12-28-2010
Please provide Input datafiles and expected output.
# 3  
Old 12-28-2010
Anurag,

My crontab looks like this.

Code:
0-59 * * * * /dev1/scripts/check_proc.sh >> /tmp/check_infa_proc_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_cores.sh >> /tmp/check_cores_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_repo_conn.sh >> /tmp/check_repo_conn_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_num_proc.sh >> /tmp/check_num_proc_cron.log 2>&1
0-59 * * * * /dev1/admin/check_pc.ksh >> /tmp/check_powercenter_cron.log 2>&1

There may be other cron entries in the file. But I want to comment out only those entries specific to my project.

for example, the last cron entry is not specific to our project.

Code:
0-59 * * * * /dev1/admin/check_pc.ksh >> /tmp/check_powercenter_cron.log 2>&1

Thanks,
Sam
Last edited by svajhala; 12-28-2010 at 03:04 PM..
# 4  
Old 12-28-2010
You can't possibly do all that in a "one-liner".

Where is your script up to now?
# 5  
Old 12-28-2010
I am not sure if this will work or not, but this is how I wrote the script.

Code:
#!/bin/ksh

. /home/.profile

. /home/.inf_env

scripts_path=/dev1/scripts

crontab -l > cronfile.txt

sed 's/[$script_path]/^#/gpw' cronfile.txt

# 6  
Old 12-28-2010
To do some action on some specific lines, some pattern has to be identified for them. Say we want to comment all lines where "pc" is a substring of script name, then:
Code:
sed '/pc/ s!.*!#&!' cron_file

Still your overall requirements are not clear. Input file is known but you need multiple processing on that file. You need to mention everything you need to do on that file along with complete expected output.
# 7  
Old 12-28-2010
Thanks for your input.

my requirement is.

get the crontab entries from the crontab command and create a tempfile.

Code:
crontab -l > cronfile.txt

Now the cronfile looks like this.

Code:
0-59 * * * * /dev1/scripts/check_proc.sh >> /tmp/check_infa_proc_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_cores.sh >> /tmp/check_cores_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_repo_conn.sh >> /tmp/check_repo_conn_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_num_proc.sh >> /tmp/check_num_proc_cron.log 2>&1
0-59 * * * * /dev1/scripts/check_pc.ksh >> /tmp/check_powercenter_cron.log 2>&1
0-59 * * * 7 /dev1/admin/scripts/check_users.ksh /tmp/check_users.log 2>&1

update the cronfile.txt by commenting all the entries where the script path is /dev1/scripts/

Code:
#0-59 * * * * /dev1/scripts/check_proc.sh >> /tmp/check_infa_proc_cron.log 2>&1
#0-59 * * * * /dev1/scripts/check_cores.sh >> /tmp/check_cores_cron.log 2>&1
#0-59 * * * * /dev1/scripts/check_repo_conn.sh >> /tmp/check_repo_conn_cron.log 2>&1
#0-59 * * * * /dev1/scripts/check_num_proc.sh >> /tmp/check_num_proc_cron.log 2>&1
#0-59 * * * * /dev1/scripts/check_pc.ksh >> /tmp/check_powercenter_cron.log 2>&1
0-59 * * * 7 /dev1/admin/scripts/check_users.ksh /tmp/check_users.log 2>&1

now execute the cronfile.txt using crontab command.

Code:
crontab cronfile.txt

Hope this is clear now.
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