Linux and Unix tutorials for new and seasoned sysadmin
Linux and Unix tutorials for new and seasoned sysadmin
I want to add more RAM to my server running Ubuntu Linux. How do I find out my current RAM chip information such as its speed, type and manufacturer name within a Linux system without opening the case?
I need to get a list of sizes in human readable du output format. How do I get the output for du command in GB under Linux or UNIX operating systems?
Continue reading “du Command Output In Human Readable Format ( GB / MB / TB )”
The rndc stats commands created /var/named/chroot/var/named/data/named_stats.txt file under RHEL 5.x or CentOS 5.x BIND 9 server. However, date is not is correct format. The date is in the following format:
grep ‘Dump’ /var/named/chroot/var/named/data/named_stats.txt
outputs:
+++ Statistics Dump +++ (1263408025)
— Statistics Dump — (1263408025)
+++ Statistics Dump +++ (1263408071)
— Statistics Dump — (1263408071)
+++ Statistics Dump +++ (1268304218)
— Statistics Dump — (1268304218)
+++ Statistics Dump +++ (1268304248)
— Statistics Dump — (1268304248)
How do I convert date (e.g., 1263408025) in a human readable format?
How do I find out file size under UNIX / Linux operating system and store the same to a variable called s?
Q. I need to find file permission and store the same to a shell variable. How do I find out the file permission without parsing ls -l output?
A. Use GNU stat command to display file or file system status. It has option to display output in specific format.
Type the following command:
$ stat /etc/passwd
Output:
File: `/etc/passwd' Size: 1675 Blocks: 8 IO Block: 4096 regular file Device: 802h/2050d Inode: 7899368 Links: 1 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2007-12-05 08:20:31.000000000 +0530 Modify: 2007-12-04 23:36:50.000000000 +0530 Change: 2007-12-04 23:36:50.000000000 +0530
Print access rights in octal format:
$ stat -c %a /etc/passwd
Output:
644
Print access rights in human readable format, enter:
$ stat -c %A /etc/passwd
Output:
-rw-r--r--
Store access rights in octal format to a shell variable:
$ VAR=$(stat -c %a /etc/passwd)
$ echo $VAR