What is the procedure of "at" and crontab" commands?
- 4 Answers
- 9780 Views
- I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / subbareddy kake
at:If you want postpone the excution of process we can use
at command.but you should specify time for running process.
batch:This command also works like at but here no need
specify the time.Unis OS itself decide the time for
processing the job.
crontab:If you want run some jobs at daily or some times u
can keep those jobs in crontab file.those are cronjobs.
crontab -l:To open crontab file
crontab -e:To edit the crontab file
crontab -r:To remove the crontab file
* * * * * job name
star1:min(1 to 59)
star2:hour(0 to 23)
star3:day of the month(1 to 31)
star4:month(1 to 12)
star5:day of the week(0 to 6)
here zero indicates sunday
15 05 * * 1-5 job schedule----->This job will run everday
at 5:15am except sunday.
Like this so many jobs we can keep in one crontab file.
| Is This Answer Correct ? | 10 Yes | 0 No |
Answer / mohan
at - executes single time
crontab- executes Multipuble time
| Is This Answer Correct ? | 7 Yes | 1 No |
Answer / s.rajasekhar
at - executes single time
crontab- executes Multiple time.
at:If you want postpone the excution of process we can use
at command.but you should specify time for running process.
crontab:If you want run some jobs at daily or some times u
can keep those jobs in crontab file.those are cronjobs.
crontab -l:To open crontab file
crontab -e:To edit the crontab file
crontab -r:To remove the crontab file
* * * * * job name
star1:min(1 to 59)
star2:hour(0 to 23)
star3:day of the month(1 to 31)
star4:month(1 to 12)
star5:day of the week(0 to 6)
here zero indicates Sunday
15 05 * * 1-5 job schedule----->This job will run everyday
at 5:15am except Sunday.
Like this so many jobs we can keep in one crontab file.
| Is This Answer Correct ? | 2 Yes | 0 No |
Answer / ajaya kumar
at time commandname - Executes the command at the
perticular time.
crontab -e and type the scheduled job with appropriate
syntax.
- Executes the script at the scheduled times.
| Is This Answer Correct ? | 3 Yes | 3 No |
How do you move a process which is running background to foreground?
what are the different hardwares available?
How to display no of records in oracle using unix command?
What is the command to compare two files in unix?
in a growing log file how will you see the 1st 99 lines?
Explain ‘library functions’ with respect to unix commands?
what are the different commands used to view the contents of a file?
What does this command do,"$more readme.txt“?
what is the advaantage of each user having its own copy of the shell?
0 Answers BMC, CNS, DELL, Infosys,
How is the command '$cat file2 ' different from '$cat >file2 and >> redirection operators ?
what is the use of nice command?
what is ls -ltd?
Unix Commands 
