Merge pull request #234 from t-stark/master

New cheatsheets

cheat/cheatsheets/cups

@@ -0,0 +1,22 @@
+# Manage printers through CUPS:
+http://localhost:631 (in web browser)
+
+# Print file from command line
+lp myfile.txt
+
+# Display print queue
+lpq
+
+# Remove print job from queue
+lprm 545
+or
+lprm -
+
+# Print log location
+/var/log/cups
+
+# Reject new jobs
+cupsreject printername
+
+# Accept new jobs
+cupsaccept printername

cheat/cheatsheets/hardware-info

@@ -0,0 +1,32 @@
+# Display all hardware details
+sudo lshw
+
+# List currently loaded kernel modules
+lsmod
+
+# List all modules available to the system
+find /lib/modules/$(uname -r) -type f -iname "*.ko"
+
+# Load a module into kernel
+modprobe modulename
+
+# Remove a module from kernel 
+modprobe -r modulename
+
+# List devices connected via pci bus
+lspci
+
+# Debug output for pci devices (hex)
+lspci -vvxxx
+
+# Display cpu hardware stats
+cat /proc/cpuinfo
+
+# Display memory hardware stats
+cat /proc/meminfo
+
+# Output the kernel ring buffer
+dmesg
+
+# Ouput kernel messages
+dmesg --kernel

cheat/cheatsheets/lib

@@ -0,0 +1,23 @@
+# Display available libraries
+ldconfig -p
+
+# Update library resources
+ldconfig
+
+# Display libraries and file location
+ldd
+
+# Libraries available to apps in real-time
+"Dynamic Libraries" (.so.)
+
+# Libraries only available to apps when installed (imported)
+"Static Libraries" (.a.)
+
+# Standard (usual) library file location
+/lib
+
+# Sofware-accessible source for library info 
+/etc/ld.so.cache 	# (binary)
+
+# Human-readable source for library info
+/etc/ld.so.conf 	# (points to /etc/ld.so.conf.d)

cheat/cheatsheets/ntp

@@ -0,0 +1,33 @@
+# Verify ntpd running:
+service ntp status
+
+# Start ntpd if not running:
+service ntp start
+
+# Display current hardware clock value:
+sudo hwclock -r
+
+# Apply system time to hardware time:
+sudo hwclock --systohc
+
+# Apply hardware time to system time:
+sudo hwclock --hctosys
+
+# Set hwclock to local time:
+sudo hwclock --localtime
+
+# Set hwclock to UTC:
+sudo hwclock --utc
+
+# Set hwclock manually:
+sudo hwclock --set --date="8/10/15 13:10:05"
+
+# Query surrounding stratum time servers
+ntpq -pn
+
+# Config file:
+/etc/ntp.conf
+
+# Driftfile:
+location of "drift" of your system clock compared to ntp servers
+/var/lib/ntp/ntp.drift

cheat/cheatsheets/ping

@@ -0,0 +1,5 @@
+# ping a host with a total count of 15 packets overall.    
+ping -c 15 www.example.com
+
+# ping a host with a total count of 15 packets overall, one every .5 seconds (faster ping). 
+ping -c 15 -i .5 www.example.com

cheat/cheatsheets/rpm

@@ -4,6 +4,9 @@ rpm -ivh <rpm>
 # To remove a package:
 rpm -e <package>
 
+# To remove a package, but not its dependencies
+rpm -e --nodeps <package>
+
 # To find what package installs a file:
 rpm -qf </path/to/file>
 
@@ -17,3 +20,12 @@ rpm -q --whatrequires <file>
 
 # To list all installed packages:
 rpm -qa
+
+# To find a pkg's dependencies
+rpm -i --test <package>
+
+# Display checksum against source
+rpm -K <package>
+
+# Verify a package
+rpm -V <package>

cheat/cheatsheets/rss2email

@@ -0,0 +1,21 @@
+'rss2email -- converts rss feeds and emails them to your inbox'
+
+# List all feeds 
+r2e list
+
+# Convert RSS entries to email
+r2e run
+
+# Add a new feed
+r2e add <feed address>
+
+# Add a new feed with new email address
+r2e add <feed address> [newemail address]
+
+# Delete a feed 
+r2e delete <# of feed in list/>
+
+# Help
+r2e -h
+
+

cheat/cheatsheets/systemd

@@ -0,0 +1,18 @@
+# Display process startup time
+systemd-analyze
+
+# Display process startup time at service level
+systemd-analyze blame
+
+# List running units
+systemctl list-units
+
+# Load a unit at startup
+systemctl enable foo.service
+
+# Start or Stop a unit
+systemctl <start | stop> foo.service
+
+# Unit file locations
+/etc/systemd/system
+/usr/lib/systemd/system