Difference between revisions of "Linux/Unix:Generic"
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| − | + | [[Category:Linux/Unix]] | |
| − | : | ||
| − | ; | + | ;Force a reboot (e.g. when mount commands are hanging) |
| − | : | + | <syntaxhighlight lang=bash> |
| + | echo 1 > /proc/sys/kernel/sysrq | ||
| + | echo b > /proc/sysrq-trigger | ||
| + | </syntaxhighlight> | ||
| + | |||
| + | ;ulimit -Sv 12000000 | ||
| + | :Set max memory to use to 12GB for this process (with option to increase (-S)) | ||
| + | |||
| + | ;cp -rL | ||
| + | :Copy recursively and dereference symbolic links (copy the file, not the link) | ||
;top | ;top | ||
| − | :List process resource usage. By default having the most CPU-intensive process on top. Press 1 to have usage for each CPU apart. | + | :List process resource usage. By default having the most CPU-intensive process on top. Press > to have it sort on another column. Press 1 to have usage for each CPU apart. |
;lscpu | ;lscpu | ||
:List CPU information | :List CPU information | ||
| + | |||
| + | ;free | ||
| + | :Show memory usage | ||
| + | |||
| + | ;cat /etc/sysctl.conf|grep swappiness | ||
| + | :Check swappines (the eager the system will swap with). A higher number means more swapping will happen. 0 is not no swapping but minimal swapping. | ||
;uname -a | ;uname -a | ||
:Show kernel version | :Show kernel version | ||
| + | |||
| + | ;mountpoint -q <directory> | ||
| + | :Check if <directory> is in use as mountpoint | ||
| + | |||
| + | ;chage -l <username> | ||
| + | :Show password aging status | ||
| + | |||
| + | ;PS1="[\u@\h \W]\$ " | ||
| + | :Set shell prompt to '[username@hostname <curdir>]$ ' | ||
| + | :\w for whole current path | ||
=RedHat (RHEL)= | =RedHat (RHEL)= | ||
;/etc/redhat-release | ;/etc/redhat-release | ||
:Redhat version installed | :Redhat version installed | ||
| + | |||
| + | ;for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done | ||
| + | :Find swapspace usage per process | ||
| + | |||
| + | ;yum list | ||
| + | :Show all packages on the rpm-server | ||
| + | |||
| + | ;yum install <packagename> | ||
| + | :Install a package from a rmp-server | ||
| + | |||
| + | =Bash= | ||
| + | ;<nowiki>:</nowiki> | ||
| + | :No operation (NOP) | ||
| + | |||
| + | ==Raspberry pi autologon== | ||
| + | In /etc/lightdm/lightdm.conf comment this line out (by putting a # in front of it) | ||
| + | |||
| + | <code>lightdm.conf:autologin-user=pi</code> | ||
Latest revision as of 22:53, 7 November 2023
- Force a reboot (e.g. when mount commands are hanging)
echo 1 > /proc/sys/kernel/sysrq
echo b > /proc/sysrq-trigger
- ulimit -Sv 12000000
- Set max memory to use to 12GB for this process (with option to increase (-S))
- cp -rL
- Copy recursively and dereference symbolic links (copy the file, not the link)
- top
- List process resource usage. By default having the most CPU-intensive process on top. Press > to have it sort on another column. Press 1 to have usage for each CPU apart.
- lscpu
- List CPU information
- free
- Show memory usage
- cat /etc/sysctl.conf|grep swappiness
- Check swappines (the eager the system will swap with). A higher number means more swapping will happen. 0 is not no swapping but minimal swapping.
- uname -a
- Show kernel version
- mountpoint -q <directory>
- Check if <directory> is in use as mountpoint
- chage -l <username>
- Show password aging status
- PS1="[\u@\h \W]\$ "
- Set shell prompt to '[username@hostname <curdir>]$ '
- \w for whole current path
RedHat (RHEL)
- /etc/redhat-release
- Redhat version installed
- for file in /proc/*/status ; do awk '/VmSwap|Name/{printf $2 " " $3}END{ print ""}' $file; done
- Find swapspace usage per process
- yum list
- Show all packages on the rpm-server
- yum install <packagename>
- Install a package from a rmp-server
Bash
- :
- No operation (NOP)
Raspberry pi autologon
In /etc/lightdm/lightdm.conf comment this line out (by putting a # in front of it)
lightdm.conf:autologin-user=pi