linux commands

Linux keyboard shortcut

switch to the first text terminals

print the name of the terminal you are typing

switch to the first GUI

shut down the system and reboot

history | more
show the last (1000 or so) commands executed from the command line on the current account.

ps axu | more
list all the processes currently running

keep listing the currently running processes on my computer

cat /etc/issue
check what distribution you are using

memory info in KB

df -h
print disk info about all the filesystems

cat /proc/cpuinfo
cpu info, shows the information about you processor. the files in the /proc directory are not real files–they are hooks to look at information available to the kernel

cat /proc/version
linux version and other info

cat /proc/filesystems
show the type of filesystems currently in use

runlevel is the mode of operation of linux.
0 – halt
1 – single user mode
2 – multiuser
3 – full multiuser mode
4 – unused
5 – X11
6 – reboot

show info on your motherboard and what cards are inserted into the pci extension slots.

display information about your hardware

[root@localhost jacobian]# dmidecode -t 16
# dmidecode 2.9
SMBIOS 2.2 present.

Handle 0x001B, DMI type 16, 15 bytes
Physical Memory Array
Location: System Board Or Motherboard
Use: System Memory
Error Correction Type: None
Maximum Capacity: 12 GB
Error Information Handle: Not Provided
Number Of Devices: 3

[root@localhost jacobian]# dmidecode -t 17 | grep Size
Size: 512 MB
Size: 256 MB
Size: 256 MB

jacobian@jacobian-HP:~$ lsb_release -d
Description: Ubuntu 8.04.1

to mount iso file
[root@localhost distro]# mount -o loop slax-6.0.1.iso /mnt/iso

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One comment on “linux commands

  1. James says:

    Sort of… but not quite.

    ctrl+alt+F7 (as you put it) is ptty7, (These are all pseudo terminals, by the way, they’re not seperate and so we call them ptty- use of tty is also more historical now, since teletype writers aren’t generally used 😉 ) – if your OS puts your wm there, then great- mine goes to ptty2.

    I’d certainly recommend less, then more- more is very primitive and is generally kept around for historic reasons.. Unless I’m very much mistaken, it has been more or less at a plateau since 1992. Case in point- forward and backward navigation.

    You’re using far too many commands here to do what uname -a does, too.

    df -h, wouldn’t use it for filesystem information, i’d give fdisk a go for that, all df does is disk space. The h switch (obviously) is for ‘human’ readable output.

    You’ve missed the point of proc- I’d reccomend looking into the Bell Lab research system, Plan 9.

    Look into runlevels, too- I see a lot of suse and ubuntu on your blog; you’ve got it more or less right for suse (you’ve missed the distinctions between 3 and 5) though ubuntu and (some) others don’t use runlevels per se, not without a good hack with telinit scripts and such ;)- You especially want to look into runlevels since you appear to be using ubuntu above.

    I’m not even going to touch your use of dmidecode, if you don’t trust /proc/ or dbus then why not actually *use* your bios, instead of some tool to try and talk to it? Not to mention that horrible use of grep; what is that showing? There is no context to it, look at the -A and -B switches in grep.

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