Cheatsheet Linux General
cat
display the content of a file
show contents of group.ini:
| <services>
<cisco_vxme_client>
enabled=<true>
</cisco_vxme_client>
<ica_client>
enabled=<true>
...
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cd
change folder
change folder to /wfs/:
chmod
change file attributes
make new.sh executable:
comm
compare two sorted files line by line
Simple method to determine command line to run (such as IGEL setup or IGEL About):
| # what processes are running BEFORE item is run?
ps -ef | sort > /tmp/ps1.txt
# what processes are running AFTER item is run?
ps -ef | sort > /tmp/ps2.txt
# what are the new processes?
# comm only showing processes in /tmp/ps2.txt
comm -1 -3 /tmp/ps1.txt /tmp/ps2.txt
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Start IGEL setup: /bin/bash /config/bin/start_setup
Start IGEL About: applauncher -style gtk2 --aboutOnly
compgen
list all the linux commands (including bash shell aliases and functions)
list all igel and remotemanager related commands:
| compgen -c | egrep "igel|_rm" | sort | more
|
| get_rmdirlist
get_rmsettings
get_rmsettings_boot
...
igel_showsplash
igel-shutdown-debug
igel-shutdown-inhibitor
--More--
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conky
system monitor
KB: Conky
Conky Reference with Examples
NOTE: To remove black rectangle on OS 12, enable the registry key windowmanager.wm0.variables.usecompositing in the registry part of your profile, and add a custom setting config name = own_window_argb_value and config value = 0 to Conky profile.
cp
copy files and folders
create backup of setup.ini:
| cp setup.ini setup.ini.bck
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date
date tool
show date:
| Mi 19. Mai 19:26:59 CEST 2020
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dig
DNS lookup utility
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12 | #!/bin/bash
MACHINE="goober.mydomainname.com"
# use the dig command to resolve an IP only on client network
if [ "$(dig $MACHINE +short)" ]; then
echo "On the client network"
echo "do some on network work now"
else
echo "Not on client network"
echo "do some off network work now"
fi
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echo
output strings
outputs "hello world" to console:
find
search for all files in the /services folder that have snmp in the name
| find /services -type f -name "*snmp*" | less
|
| /services/cups/lib/cups/backend/snmp
/services/cups/share/cups/doc-root/help/man-cups-snmp.html
/services/cups/share/cups/snmp.conf.default
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grep
search for regular expression
search for configured UMS server name:
| more /wfs/setup.ini | grep "ip="
|
| ip=<igelrmserver.int.acme.org>
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kill
kill a running task by process id
kill process with PID 48:
killall
kill a running task by name
kill process with name pnlogin:
| killall pnlogin 2>/dev/null
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less
less is more and allows backward movement (hit "b" key) in the file, as well as forward movement (hit "f" key), search for string (hit "/" key and enter string to search for), or to quit (hit "q" key)
show contents of group.ini, hit key "f" to go forward, hit key "b" to go backward, hit key "/" and the text to search for:
ls
show directory content
long list current directory:
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13 | total 96
drwxr-xr-x 3 root root 60 Mai 20 13:49 apparmor
drwxr-xr-x 2 root root 40 Mai 20 13:49 asset.events
-rw-r--r-- 1 root root 2765 Mai 20 13:50 asset.ini
drwxr-xr-x 2 root root 100 Mai 20 13:50 ca-certs
drwxr-xr-x 2 root root 60 Mai 20 13:49 chrony
...
-rw------- 1 root root 106 Mai 20 13:50 systemkey
-rw-r--r-- 1 root root 49 Mai 20 13:50 systemmd5
-rw------- 1 root root 32 Mai 20 13:49 tckey
-rw------- 1 root root 214 Mai 20 13:49 updateconf.ini
drwxr-xr-x 14 user users 440 Mai 20 13:50 user
drwxr-xr-x 2 root root 40 Mai 20 13:49 zoneinfo
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lshw
list hardware
mkdir
create a folder
create folder with name newdir:
create folder dir3 and make parent directories dir2 and dir1 if they do not exist
| mkdir -p /tmp/dir1/dir2/dir3
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more
display the content of a file page by page
show contents of group.ini, hit space to continue to next page:
| <services>
<cisco_vxme_client>
enabled=<true>
</cisco_vxme_client>
<ica_client>
enabled=<true>
...
|
mount
mount a partition
mount license folder writeable:
| mount -o remount,rw /license
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openssl
OpenSSL command line tool
Find end date on certificates
| cd /etc; find . -type f \( -name "*.cer" -o -name "*.crt" -o -name "*.pem" \) -exec echo "FILE NAME: ==> " {} \; -exec openssl x509 -enddate -noout -in {} \;
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ps
show running tasks
| UID PID PPID C STIME TTY TIME CMD
root 1 0 0 13:49 ? 00:00:03 /sbin/init 3
root 2 0 0 13:49 ? 00:00:00 [kthreadd]
root 3 2 0 13:49 ? 00:00:00 [rcu_gp]
root 4 2 0 13:49 ? 00:00:00 [rcu_par_gp]
root 6 2 0 13:49 ? 00:00:00 [kworker/0:0H-kb]
root 8 2 0 13:49 ? 00:00:00 [mm_percpu_wq]
root 9 2 0 13:49 ? 00:00:00 [ksoftirqd/0]
root 10 2 0 13:49 ? 00:00:00 [rcu_sched]
root 11 2 0 13:49 ? 00:00:00 [rcu_bh]
...
|
pwd
print working directory
rm
delete a file
delete file with name new.sh:
rmdir
delete a folder
delete folder with name newdir:
sleep
wait
wait for 5 seconds:
su
change to root
systemctl
service handler
restart network:
| systemctl restart network-manager
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top
task monitor
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13 | top - 14:15:59 up 26 min, 2 users, load average: 0,05, 0,01, 0,01
Tasks: 236 total, 1 running, 168 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0,1 us, 0,1 sy, 0,0 ni, 99,8 id, 0,0 wa, 0,0 hi, 0,0 si, 0,0 st
KiB Mem : 1891000 total, 351040 free, 481452 used, 1058508 buff/cache
KiB Swap: 1134592 total, 1134592 free, 0 used. 1183616 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
18620 root 20 0 79776 4276 3520 R 0,3 0,2 0:00.02 top
1 root 20 0 205624 9980 5812 S 0,0 0,5 0:03.88 systemd
2 root 20 0 0 0 0 S 0,0 0,0 0:00.00 kthreadd
3 root 0 -20 0 0 0 I 0,0 0,0 0:00.00 rcu_gp
4 root 0 -20 0 0 0 I 0,0 0,0 0:00.00 rcu_par
...
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touch
create a file
create file with name new.sh:
tr
translates, deletes, and squeezes characters
Print $PATH directories on a separate line
| /bin
/sbin
/usr/bin
/usr/sbin
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Remove the repeated space characters
| ps -ef | tr -s ' ' | grep terminal
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| user 23850 23849 0 10:30 ? 00:00:00 /usr/bin/xfce4-terminal -T Local Terminal -e check_passwd --disable-server --geometry 90x38
user 23915 23860 0 10:44 pts/0 00:00:00 grep --color=auto terminal
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Remove all non-numeric characters
| echo "IGEL support for Priority or Plus support phone number for US and Canada is 415-813-3933" | tr -cd [:digit:]
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uname
show linux details
user_shutdown
shutdown the system
user_reboot
reboot the system
vi
texteditor
open setup.ini in vi:
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16 | <system>
<remotemanager>
<server0>
ip=<igelrmserver.int.acme.org>
</server0>
</remotemanager>
<icg>
<server0>
host=<icg.acme.org>
uuid=<d8d43ff7a4274b8f96fb6ec96c4948>
....
<drivers>
currentdriver=<intel>
currentconnectors=<lvds1,Seiko Epson Corporation,,1366,768,1366,768,0,0,,;>
</drivers>
</x>
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watch
repeat periodic a command
probe tcp port 8443 on igelrmserver every 2 seconds:
| watch probeport igelrmserver 8443
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| Every 2,0s: probeport igelrmserver 8443 ITCA44CC8C90000: Wed May 20 14:24:08 2020
Connection successful
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wget
non-interactive network downloader
- Obtain internet IP address for device
| wget -qO- http://ipv4.icanhazip.com; echo
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- Download IGEL OS 12.3.2 OSC installer
| wget https://az743625.vo.msecnd.net/files/IGEL_OS_12/OSC/osc-12.3.2.zip
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| wget https://<server:port>/ums_filetransfer/file_name --no-check-certificate --user=username --password=password
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which
locate command
locate command nmcli:
| /usr/bin/nmcli
sleep 1; xset dpms force on; # dpms screen ON after a delay of one second.
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wmctrl
List windows managed by the window manager
Close VMware window
Execute the VMware Horizon client as maximized or full screen using wmctrl command
| #!/bin/bash
/config/sessions/vdm_client0 &
sleep 2 &&
#uncomment for maximized
wmctrl -x -r vmware-view -b add,maximized_vert,maximized_horz
#uncomment for fullscreen
#wmctrl -x -r vmware-view -b add,fullscreen
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Bring IGEL UMS Console to the foreground
| 0x02000003 -1 ITC08002792DECB xfce4-panel
0x02200069 -1 ITC08002792DECB Desktop
0x03200003 0 ITC08002792DECB X11
0x03400401 0 igelums12 IGEL Universal Management Suite 12
0x03800003 0 ITC08002792DECB Local Terminal
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- Raise UMS Console to the foreground
| wmctrl -i -a $(wmctrl -l | grep igelums | cut -f 1)
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utility to configure and test X input devices
list all input devices:
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13 | ⎡ Virtual core pointer id=2 [master pointer (3)]
⎜ ↳ Virtual core XTEST pointer id=4 [slave pointer (2)]
⎜ ↳ 3830303142534F54:00 06CB:CE46 Mouse id=11 [slave pointer (2)]
⎜ ↳ Logitech USB-PS/2 Optical Mouse id=9 [slave pointer (2)]
⎜ ↳ 3830303142534F54:00 06CB:CE46 Touchpad id=12 [slave pointer (2)]
⎣ Virtual core keyboard id=3 [master keyboard (2)]
↳ Virtual core XTEST keyboard id=5 [slave keyboard (3)]
↳ Toshiba input device id=14 [slave keyboard (3)]
↳ Video Bus id=6 [slave keyboard (3)]
↳ Power Button id=7 [slave keyboard (3)]
↳ Sleep Button id=8 [slave keyboard (3)]
↳ AT Translated Set 2 keyboard id=13 [slave keyboard (3)]
↳ Web Camera - HD: Web Camera - H id=10 [slave keyboard (3)]
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disable touchpad:
| xinput set-prop "3830303142534F54:00 06CB:CE46 Touchpad" "Device Enabled" 0
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xset
user preference utility for X
Screen Blanking
testing dpms signal for monitor to turn off, waiting 15 seconds, then signal monitor to turn on
| sleep 1; xset dpms force off; sleep 15; xset dpms force on;
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| sleep 1; xset s activate; # will blank the screen (or activate the screensaver program, if you're using one) after a delay of one second
sleep 1; xset dpms force off; # dpms turn the screen OFF after a delay of one second.
sleep 1; xset dpms force standby; # dpms screen standby after a delay of one second.
sleep 1; xset dpms force suspend; # dpms screen suspend after a delay of one second.
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zenity
Display dialog window, and return (either in the return code, or on standard output) the users input
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15 | #!/bin/bash
Zenity_String=$(zenity --forms --title="Create user" --text="Add new user" \
--add-entry="First Name" \
--add-entry="Last Name" \
--add-entry="Username" \
--add-password="Password" \
--add-password="Confirm Password" \
--add-calendar="Expires")
First_Name=$(echo $Zenity_String | cut -d "|" -f 1)
Last_Name=$(echo $Zenity_String | cut -d "|" -f 2)
echo "Zenity String: " $Zenity_String
echo "First Name: " $First_Name
echo "Last Name: " $Last_Name
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