linux command

Here's how you specify the nohup option for a process:

$ nohup test.ksh
$ test.ksh &[1]    27149

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Outputting Columns with the cut Command
The cut command will output specified columns from a text file. Let's say you have a file named example.txt with the following text:
one two threefour five sixseven eight nineten eleven twelve
You can specify the fields you want to extract with the -f option. The following command will return just the second column in the example.txt file:
$ cut -f2 example.txttwofiveeighteleven
 
You use the -c option with the cut command to specify the specific characters you want to extract from a file. The following two commands extract the tenth character and then characters 10-12 from the password.txt file:
$ password.txt | cut -c10$ password.txt | cut -c10-12
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$ test "ONE" = "one"$ echo $?0
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The following tar command will copy the data01.dbf file to a tape, with the format /dev/rmt/0m. The -cvf option creates a new archive (the hyphen is optional). The c option asks tar to create a new archive file, and the v option stands for verbose, which specifies that the files be listed as they are being archived: 
$ tar -cvf /dev/rmt/0m   /u10/oradata/data/data01.dbf
The following tar command will extract the backed-up files from the tape to the specified directory:
$ tar -xvf/dev/rmt/0m    /u20/oradata/data/data01.dbf
 
The x option asks tar to extract the contents of the specified file. The v and f options have the same meanings as in the previous example.
The cpio command with the -o (copy out) option copies files to standard output, such as disk or tape. The following command will copy the contents of the entire current directory (all the files) to the /dev/rmt/0m tape:
 
$ ls | cpio -0 > /dev/rmt/0m
 
 
The cpio command with the -i (copy in) option extracts files from standard input. The following command restores all the contents of the specified tape to the current directory:
$ cpio -i < /dev/rmt/0m
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$ crontab -e
 
Each line in the crontab is an entry for a regularly scheduled job or program, and you edit the crontab the same way you edit any normal vi-based file. Each line in the /etc/crontab file represents a job that you want to execute, and it has the following format:
minute         hour     day    month     day of week       command
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$ sar -u 1 10HP-UX prod5 B.11.11 U 9000/800   04/07/0816:11:21    %usr      %sys      %wio   %idle16:11:22      34         6        56       416:11:23      31         7        55       716:11:24      45         9        43       416:11:25      45         9        44       216:11:26      45        11        40       316:11:27      46        11        40       416:11:28      48        10        40       316:11:29      56        11        31       216:11:30      50        12        36       316:11:31      45        12        39       4Average       44        10        42       4$
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