Tuesday 26 July 2016
Thursday 17 December 2015
50 Basic Linux commands for server admins.
Linux_Experts Group: https://www.youtube.com/channel/UCgCP_rPV7tarYKL4Bh82Dgg
1) ls -ltr --> Long list with the last modified time.
2) top --> Check running processes.
3) pwd --> Currently working directory.
4) uptime --> Server uptime.
5) uname -a --> Server Name and OS version.
6) clear -->Clear the screen.
7) cd -->Change directory.
8) history -->Commands history.
9) cp <Source> <Destination> --> Copy from source to destination.
10) mv <Source> <Destination>--> Move from source to destination.
11) df -h <dir> --> Check filesystem usage.
12) mkdir <filename> --> Make directory.
13) rmdir <filename --> Remove directory.
14) ps -ef --> Check services.
15) sar 2 5 --> CPU usage.
16) sar -B 2 5 --> System paging rate.
17) free mt --> Check memory usage.
18) sort -nr --> Sort the listed output.
19) head -5 -->Top 5 outputs.
20) tail -5 --> Last 5 outputs.
21) grep -i --> Fetch the matched contents.
22) grep -v --> Exclude the matched contents.
23) kill --> Kill the particular process.
24)w -->Who is logged on and what they are doing
25) passwd <usrname> --> Change password.
26) chmod --> Modify the filesystem, Change the access permission.
27) chown x:x <filename> --> Change File Ownership.
28) rm -rf --> Remove forcefully.
29) du -sh * --> Total disk space occupied by files and subdirectories.
30) cat /etc/shadow --> Check user password information.
31) cat /etc/passwd --> Check users information.
32) sudo su - --> To login as a root from current user.
33) ifconfig -a --> Network interfaces.
34) service <xyz> status --> Check service status.
35) service <xyz> start/stoop --> Start/stop services.
37) gzip <filename> -->Compresses the contents of files.
37) gunzip <filename> -->Unzip the compressed file.
38) diff <file1><file2> -->Lists all lines that do not match.
39) mount <mountpoint> -->Mount any data media to Linux directory.
40) nslookup <IP OR Server name-->The DNS resolves domain names to IP addresses & vice versa.
41) touch <filename> -->Create a blank txt file.
42) vim <filename> --> Open and edit the file.
43) crontab -l -->List the cron jobs.
44) locate <filename> -->Search for the location of a specific file.
45) vmstat -->Info about processes, memory, paging, and cpu activity.
46) who -->tells you who's logged on, and where they're coming from
47) useradd <username> --> Add new user.
48) userdel <username> --> Delete the user.
49) reboot --> Restart the system.
50) shutdown --> System shut down.
1) ls -ltr --> Long list with the last modified time.
2) top --> Check running processes.
3) pwd --> Currently working directory.
4) uptime --> Server uptime.
5) uname -a --> Server Name and OS version.
6) clear -->Clear the screen.
7) cd -->Change directory.
8) history -->Commands history.
9) cp <Source> <Destination> --> Copy from source to destination.
10) mv <Source> <Destination>--> Move from source to destination.
11) df -h <dir> --> Check filesystem usage.
12) mkdir <filename> --> Make directory.
13) rmdir <filename --> Remove directory.
14) ps -ef --> Check services.
15) sar 2 5 --> CPU usage.
16) sar -B 2 5 --> System paging rate.
17) free mt --> Check memory usage.
18) sort -nr --> Sort the listed output.
19) head -5 -->Top 5 outputs.
20) tail -5 --> Last 5 outputs.
21) grep -i --> Fetch the matched contents.
22) grep -v --> Exclude the matched contents.
23) kill --> Kill the particular process.
24)w -->Who is logged on and what they are doing
25) passwd <usrname> --> Change password.
26) chmod --> Modify the filesystem, Change the access permission.
27) chown x:x <filename> --> Change File Ownership.
28) rm -rf --> Remove forcefully.
29) du -sh * --> Total disk space occupied by files and subdirectories.
30) cat /etc/shadow --> Check user password information.
31) cat /etc/passwd --> Check users information.
32) sudo su - --> To login as a root from current user.
33) ifconfig -a --> Network interfaces.
34) service <xyz> status --> Check service status.
35) service <xyz> start/stoop --> Start/stop services.
37) gzip <filename> -->Compresses the contents of files.
37) gunzip <filename> -->Unzip the compressed file.
38) diff <file1><file2> -->Lists all lines that do not match.
39) mount <mountpoint> -->Mount any data media to Linux directory.
40) nslookup <IP OR Server name-->The DNS resolves domain names to IP addresses & vice versa.
41) touch <filename> -->Create a blank txt file.
42) vim <filename> --> Open and edit the file.
43) crontab -l -->List the cron jobs.
44) locate <filename> -->Search for the location of a specific file.
45) vmstat -->Info about processes, memory, paging, and cpu activity.
46) who -->tells you who's logged on, and where they're coming from
47) useradd <username> --> Add new user.
48) userdel <username> --> Delete the user.
49) reboot --> Restart the system.
50) shutdown --> System shut down.
Monday 29 June 2015
Thursday 25 June 2015
Hello All Here we will write about tyhe DF command in Linux
please find the below entry of df command how to use it
please find the below entry of df command how to use it
NAME
df - report file system disk space usageSYNOPSIS
df [OPTION]... [FILE]...DESCRIPTION
This manual page documents the GNU version of df. df displays the amount of disk space available on the file system containing each file name argument. If no file name is given, the space available on all currently mounted file systems is shown. Disk space is shown in 1K blocks by default, unless the environment variable POSIXLY_CORRECT is set, in which case 512-byte blocks are used. If an argument is the absolute file name of a disk device node containing mounted file system, df shows the space available on that file system rather than on the file system containing the device node (which is always the root file system). This version of df cannot show the space available on unmounted file systems, because on most kinds of systems doing so requires very nonportable intimate knowledge of file system structures.OPTIONS
Show information about the file system on which each FILE resides, or all file systems by default. Mandatory arguments to long options are mandatory for short options too. -a, --all include dummy file systems -B, --block-size=SIZE use SIZE-byte blocks -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G) -H, --si likewise, but use powers of 1000 not 1024 -i, --inodes list inode information instead of block usage -k like --block-size=1K -l, --local limit listing to local file systems --no-sync do not invoke sync before getting usage info (default) -P, --portability use the POSIX output format --sync invoke sync before getting usage info -t, --type=TYPE limit listing to file systems of type TYPE -T, --print-type print file system type -x, --exclude-type=TYPE limit listing to file systems not of type TYPE -v (ignored) --help display this help and exit --version output version information and exit SIZE may be (or may be an integer optionally followed by) one of fol- lowing: kB 1000, K 1024, MB 1000*1000, M 1024*1024, and so on for G, T, P, E, Z, Y.
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