Login or Register to Ask a Question and Join Our Community


AIX

Comment out crontab using sed command

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Operating Systems AIX Comment out crontab using sed command
# 1  
Old 10-09-2013
Comment out crontab using sed command
I am trying to comment out the crontab entries using sed.
I want to comment it out for a particular environment say '/mypath/scripts/'.

Using the full path as pattern, it is working. but using variable it is not working. i have tried double quotes too. but no luck!

Code:
$ crontab -l

0,20,40 * * * * /mypath/scripts/script1.sh
15,35,55 * * * * /mypath/scripts/script2.sh
5,15,25,35,45,55 * * * * /somepath/somedirectory/script3.sh

$ PATTERN=/mypath/scripts

$ crontab -l > cron.backup
$ sed "/${PATTERN}/s!^!#!" cron.backup > newCron.sample

$ crontab newCron.sample

I have also tried to escape the '$' and the braces also.

Code:
$ sed "/\${PATTERN}/s!^!#!" cron.backup > newCron.sample

$ sed "/\$\{PATTERN\}/s!^!#!" cron.backup > newCron.sample

None of the above is working. but if I use the following code, its working absolutely fine

Code:
$ sed "/\/mypath\/scripts/s!^!#!" cron.backup > newCron.sample

# 2  
Old 10-09-2013
I'd say it doesn't like the / chars in PATTERN. Try to escape them; execute with set -vx
# 3  
Old 10-09-2013
Thanks RudiC !
I am not familiar with the use of 'set' and could not find any suitable example too. Could you please elaborate on the same?
# 4  
Old 10-09-2013
You could also use either "|" or "\\" as a sed limiter,
actualy "," would be possible too - but not in this case.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

One Line Command how to use pipe statements to execute and comment on multiple possible outcomes

Hello Forum, I'm looking to expand the following command: INACTIVE_KERNELS=$(python -mplatform | grep -qi red && rpm -qa | grep '^kernel-' |grep -vE `uname -r` | paste -sd \; || echo "Not Red Hat Server") Currently this command will check if my server is RedHat server using the grep -qi... (6 Replies)
Discussion started by: greavette
6 Replies

2. Shell Programming and Scripting

sed/awk script to replace only FIRST comment in the file

My first comment on every file contains the license message. I want to replace with a new license message. I used the below sed script, which replaces all comments. What is the modification or any other method with awk script for the below to edit only the first comment(license message)? #sed -f... (1 Reply)
Discussion started by: vpshastry
1 Replies

3. Shell Programming and Scripting

sed escape character for comment string "/*"

Good afternoon all, I'm hoping my newbie question can help bolster someone's street_cred.sh today. I'm trying to "fingerprint" SQL on its way into the rdbms for a benchmarking process (so I can tie the resource allocation back to the process more precisely). To do this, I'm essentially... (4 Replies)
Discussion started by: toeharp
4 Replies

4. Shell Programming and Scripting

sed adding/removing comment in crontab

I have a requirement where I want to add a comment '#' in my crontab, run a process, than remove the '#' I added. Example cron #5,10 * * * * ls -lt /tmp 10,5 * * * * ls -lt /var I would like to be able use sed or awk to add a '#' at the begining of each line. After the command... (4 Replies)
Discussion started by: BeefStu
4 Replies

5. Shell Programming and Scripting

Comment a line with SED

I have around 25 hosts and each hosts has 4 instance of jboss and 4 different ip attached to it . I need to make some changes to the startup scripts. Any tips appreciated. I have total of 100 instances which bind to 100 different ip address based on instance name. For example File1 ... (1 Reply)
Discussion started by: gubbu
1 Replies

6. Shell Programming and Scripting

Using sed to comment out line in /etc/vfstab

I am running a script remotely to do the following 1. Kill all processes by a user 2. Uninstall certain packages 3. FTP over a new file 4. Kill a ldap process that is not allowing my /devdsk/c0t0d0s7 slice to un-mount 5. Unmount /h 6. comment out the slice in vfstab 7. newfs the... (9 Replies)
Discussion started by: deaconf19
9 Replies

7. Shell Programming and Scripting

Help using SED to comment XML elements

I'm trying to write a script to help automate some VERY tedious manual tasks. I have groups of fairly large XML files (~3mb+) that I need to edit. I need to look through the files and parse the XML looking for a certain flag contained in a field. If I find this flag (an integer value) I need... (4 Replies)
Discussion started by: J-Hon
4 Replies

8. Shell Programming and Scripting

get rid of xml comment by grep or sed

Hi, I would like to get rid of all comment in an xml file by grep or sed command: The content seem like this: <!-- ab cd ef gh ij kl --> Anyone can help? Thanks and Regards (3 Replies)
Discussion started by: RonLii
3 Replies

9. Shell Programming and Scripting

sed/awk to insert comment at defined line number

Hi there, may someone easily help me on this : I want to insert a text in a specific line number like : linenumb2start=`cat memory_map.dld | nl -ba | egrep -i "label" | cut -f1` line2insert=`expr $linenumb2start + 2` and now I need to replace something like {} with {comment} at... (8 Replies)
Discussion started by: homefp
8 Replies

10. Shell Programming and Scripting

sed and crontab

Hi , what is the simple way to do the following : i would search in a crontab file for specific string of characters (ex: toto.ksh) and only on this line change the beginning as follows : 00 23 * * 0 with 00 23 * * 3 or maybe 2 changes: with 10 23 * * 3 thanks in advance Christian (7 Replies)
Discussion started by: Nicol
7 Replies
Login or Register to Ask a Question