Command line cheat sheet

cheats/shell.cheat

@@ -0,0 +1,248 @@
+
+% Shell Usage 
+
+# Re-call last input with sudo
+sudo !!
+
+# Help
+help cd / help dir (...)
+
+# Finding Help
+apropos directory / apropos search (...)
+
+# Define custom startup screen
+sudo nano /etc/motd
+
+# Run a script as background process
+python script.py &
+
+# List all running process's
+ps aux
+
+# Kill a running process
+sudo kill <12345>
+
+% Shell System
+
+# Get the current path
+pwd
+
+# Copy to clipboard
+pwd | pbcopy
+
+# Paste
+pbpaste
+
+# Get the current hostname
+hostname
+
+# Get the current users
+users
+
+# Get all info about the environment
+env
+
+# Show calendar
+cal
+
+# Show today's date
+date
+
+# Exit terminal
+exit
+
+% Shell Permissions
+
+# Use -R option to change permissions recursively.
+
+# List
+ps -ef | grep apache | grep -v grep
+
+# Change permissions
+chmod 755 <index>
+
+# Change group
+chgrp <group-name> <index>
+
+% Shell WordPress Files/Folder Permissions
+
+# Let apache be owner
+chown <www-data>:<www-data> -R *
+
+# Change directory permissions rwxr-xr-x
+find . -type d -exec chmod 755 {} \;
+
+# Change file permissions rw-r--r--
+find . -type f -exec chmod 644 {} \;
+
+% Shell Directories
+
+# List directory contents
+ls
+
+# List all directory contents
+ll
+
+# List all directory contents sorted by time edited
+ls -alt
+
+# List directory (wildcard matching)
+ls *.<txt>
+
+# List all files of type
+find . -name *.<txt> -print
+
+# Go back to previous directory
+cd -
+
+# Make (empty) directory
+mkdir <dirname>
+
+# Remove (empty) directory
+rmdir <sample-dirname>
+
+# Remove directory with all contents without prompt
+rm -rf <sample-dirname>
+
+# Remove directory contents and keep directory
+rm -rf *
+
+# Checkout directory
+cd <sample-dirname>
+
+% shell Symlinks
+
+# Create symlink
+ln -s <source-dirname> <destination-dirname>
+
+# Update symlink
+ln -sfn <source-dirname> <destination-dirname>
+
+# Remove symlink
+unlink <sample-dirname>
+
+% Shell Files
+
+# Make (empty) file
+touch <filename-txt>
+
+# Change creation date
+touch –t <yymmddhhmm> <filename>
+
+# Change modified date
+touch –mt <yymmddhhmm> <filename>
+
+# Duplicate file
+cp <filename-txt> <filename-copy-txt>
+
+# Copy/Page folder with content
+cp -a <old-folder>/ <new-folder>
+
+# Move/Rename file
+mv <current-filename-txt> <new-filename-txt>
+
+# Move/Rename file and prompt before overwriting an existing file
+mv -i <current-filename-txt> <new-filename-txt>
+
+# Remove file
+rm <filename-txt>
+
+# View file
+less <filename-txt> / more <sample-filename-txt>
+
+# Write to file (will overwrite existing content)
+cat > <filename-txt> 
+
+# Search for a filename-(not content!) in the current directory
+find <filename-txt>
+
+# Search for a string inside all files in the current directory and subdrectories
+grep -r <string> *
+
+# Search and replace within file
+sed -i 's/<original-text>/<new-text>/g' <filename-txt>
+
+# MD5 hash for files
+md5 <filename-txt>
+
+# MD5 hash for folders
+tar c <folder> | md5sum
+
+# Encrypt file
+openssl enc -aes-256-cbc -e -in <sample-filename-txt -out <sample-encrypted-txt>
+
+# Decrypt file
+openssl enc -aes-256-cbc -d -in <sample-encrypted> -out <sample-filename>
+
+% Shell Server
+
+# Access via ssh
+ssh <username@remote>
+
+# Copy file from server to local
+scp <username@remote>:<file-to-send-path> <path-to-recieve> 
+
+# Copy file from local to server
+scp <file-to-end> <username@remote>:<where-to-put>
+
+# Escape files with spaces in name like this
+<-path-to-file>\\\ <name-png>
+
+% Shell System
+
+# Show disc space
+df -h
+
+# Show disc space (inodes)
+df -i
+
+# Show disc space for current directory
+du -hs
+
+# Current processes (also CPS usage)
+top or htop
+
+# Show running php processes
+ps aux | grep php
+
+# Monitor error log (stream as file grows)
+tail error.log -f -n 0
+
+% Shell Apps
+
+# Start appliction
+open -a <programme> 
+
+# Open finder with current folder
+open .
+
+% Shell Variables
+
+# Register variable
+export <TESTING>=<Sample-Text>
+
+# Echo variable
+echo $<TESTING>
+
+# Unset variable
+unset <TESTING>
+
+% Shell Output & Redirects
+
+# Write to file
+echo <Hello> > <hello-txt>
+
+# Append content from a file to another file
+cat <file1-txt> >> <file2-txt>
+
+# Add the amount of lines, words, and characters to <file2-txt>
+cat <file1-txt> | <word-count> | cat > <file2-txt>
+
+# Sort the content of a file (like cat)
+sort <hello.txt>
+.txt
+# Save to sorted content to a new file
+cat <file1-txt> | sort > <sorted-file1-txt>
+
+# Sort and remove duplicates and save to a new file
+sort <file1-txt> | uniq > <uniq-file1-txt>