Self-reminders

ba.sh

# Tell a program to completely shut the fuck up
(npm install get-options) >/dev/null 2>&1

# Repeat a character a certain number of times
printf %100s | tr ' ' '='

# Hide/show files or directories in Finder
chflags hidden    /path/to
chflags nohidden  /path/to

# Print a progress bar
printf %s"\r" "####-----(33%)"

# Compare lines of two different files
comm $FILE1 $FILE2

# Delete empty lines
sed '/^\s*$/d' file.txt
sed -n $'/[^ \t]/,$p'                  # Empty lines at start-of-file only
sed -e :a -e '/^\n*$/{$d;N;};/\n$/ba'  # Empty lines at end-of-file only

# Recursively delete shit
find /path/to/dir -name "*.DS_Store" -type f -delete # Delete files
find /path/to/dir -name "*.git" -type d -delete # Delete directories

# Recursively execute something on shit
find /path/to/thing -type d -exec sudo chmod 2775 {} +

# Retrieve modification time in Epoch/“Unix Timestamp” format
stat -f %m $FILE

# Retrieve timestamp in English
stat -f '%Sm -> %N'

# Get permission bits of file/directory in octal format
gstat -c %a    # Darwin/macOS
stat -c %a     # Linux

# Restore git repo to last committed state, verbatim
git reset --hard HEAD; git clean -fd

# Undo last commit (as long as it's not been pushed)
git reset --soft HEAD~1

# Compress folder without .DS_Store junk
zip -r archive.zip directory/path/ -x "*.DS_Store"

# Remove suffix from multiple filenames
for i in *; do mv $i $(echo $i | sed -E 's/_[SMLH]\.(jpe?g|png)$/.\1/g'); done

# Echo to STDERR
>&2 echo 'ERROR: Message.';

# Shell file loop
for i in $@; do; done;


# Less often used
# ===============

# Extract tarball on OpenBSD
# http://www.linuxmisc.com/27-openbsd/e954bddfdade667e.htm
tar xvfz filename.tar.gz

# Upgrade NodeJS Package Manager (NPM)
npm install -g npm@latest

# Reset permissions on files for WordPress on AWS
find . -type d -exec sudo chmod 2775 {} +

# Pull contents of a subdirectory into current directory
for i in wordpress/*; do mv "$i" $(basename "$i"); done;

# Restart Apache (after changing vhosts file)
sudo apachectl -k graceful

# Trash stupid local commits and revert repo state from remote
git reset --hard origin/master

# Fix an incorrect commit message
git commit --amend  # Yes, that’s really all

# Show what file modifications are staged in Git
git diff --cached   # Yep, that’s really all, too.

# Squash-merge a topic branch into master
git merge --squash branch-name

# Show all hidden files
defaults write com.apple.finder AppleShowAllFiles 1
killall Finder

# Enable local file access in Chrome
/Applications/Google\ Chrome.app/Contents/MacOS/Google\ Chrome --allow-file-access-from-files

# Disable “Opening Downloaded File” warning in macOS
defaults write com.apple.LaunchServices LSQuarantine -bool NO

# Reset position of window in macOS
osascript -e 'tell application "System Events" to tell process "FileZilla"
set position of windows to {0, 0}
end';

# Reset size of window in macOS
osascript -e 'tell first window of application "Google Chrome" to set bounds to {0, 0, 1440, 820}'

# Rsync example
rsync -e "ssh -i $HOME/.ssh/khq.pem" -rt ./tim-test/ ec2-user@khqapproved.com.au:/var/www/html/tim-test

# Remove com.apple.quarantine attribute recursively
find . -print0 -type f -o -type d | xargs -0 xattr -d com.apple.quarantine

# Create and mount a case-sensitive filesystem on macOS
hdiutil create -size 1g -fs 'Case-sensitive APFS' -type UDIF -nospotlight -attach


	

perl.pl

use Data::Dumper;
print Dumper($data);

\K - Keep out # Lowercase \k is \k<group>


# ARGV
for (@ARGV) {
}

$first_arg = $ARGV[0];


# Functions
sub name {
	@_      # Arguments. Mnemonic: "@rgs"
	$_[0]   # First argument
}

# for-loop
for my $value ("a", "b", "c") {
	say $value;
}

# Heredoc
print <<"EOF";
sdgdsgsdg
EOF

rsync-example.sh

# Mirror locally
rsync -avzH --inplace --delete \
	rsync://mirror.internode.on.net/openbsd/6.7/amd64 6.7

# Sorted option-summary
-@, --modify-window NUM  # Set the accuracy for mod-time comparisons
-0, --from0              # All *-from/filter files are delimited by 0s
-4, --ipv4               # Prefer IPv4
-6, --ipv6               # Prefer IPv6
-8, --8-bit-output       # Leave high-bit chars unescaped in output
-A, --acls               # Preserve ACLs (implies --perms)
-a, --archive            # Archive mode; equals -rlptgoD (no -H,-A,-X)
--address ADDRESS        # Bind to the specified address
--append                 # Append data onto shorter files
--append-verify          # --append w/old data in file checksum
-b, --backup             # Make backups (see --suffix & --backup-dir)
-B, --block-size SIZE    # Force a fixed checksum block-size
--backup-dir DIR         # Make backups into hierarchy based in DIR
--blocking-io            # Use blocking I/O for the remote shell
--bwlimit RATE           # Limit socket I/O bandwidth
-c, --checksum           # Skip based on checksum, not mod-time & size
-C, --cvs-exclude        # Auto-ignore files in the same way CVS does
--checksum-choice STR    # Choose the checksum algorithm (aka --cc)
--checksum-seed NUM      # Set block/file checksum seed (advanced)
--chmod CHMOD            # Affect file and/or directory permissions
--chown USER:GROUP       # Simple username/groupname mapping
--compare-dest DIR       # Also compare destination files relative to DIR
--compress-choice STR    # Choose the compression algorithm (aka --zc)
--compress-level NUM     # Explicitly set compression level (aka --zl)
--config FILE            # Specify alternate rsyncd.conf file
--contimeout SECONDS     # Set daemon connection timeout in seconds
--copy-as USER[:GROUP]   # Specify user & optional group for the copy
--copy-dest DIR          # ... and include copies of unchanged files
--copy-unsafe-links      # Only "unsafe" symlinks are transformed
-D                       # Same as --devices --specials
-d, --dirs               # Transfer directories without recursing
--daemon                 # Run as an rsync daemon
--debug FLAGS            # Fine-grained debug verbosity
--del                    # An alias for --delete-during
--delay-updates          # Put all updated files into place at end
--delete                 # Delete extraneous files from dest dirs
--delete-after           # Receiver deletes after transfer, not during
--delete-before          # Receiver deletes before xfer, not during
--delete-delay           # Find deletions during, delete after
--delete-during          # Receiver deletes during the transfer
--delete-excluded        # Also delete excluded files from dest dirs
--delete-missing-args    # Delete missing source args from destination
--devices                # Preserve device files (super-user only)
-E, --executability      # Preserve executability
-e, --rsh COMMAND        # Specify the remote shell to use
--early-input FILE       # Use FILE for daemon's early exec input
--exclude PATTERN        # Exclude files matching PATTERN
--exclude-from FILE      # Read exclude patterns from FILE
--existing               # Skip creating new files on receiver
-F                       # Same as --filter='dir-merge /.rsync-filter', repeated: --filter='- .rsync-filter'
-f, --filter RULE        # Add a file-filtering RULE
--fake-super             # Store/recover privileged attrs using xattrs
--fileflags              # Preserve file-flags (aka chflags)
--files-from FILE        # Read list of source-file names from FILE
--force-change           # Affect user-/system-immutable files/dirs
--force-delete           # Force deletion of directories even if not empty
--force-schange          # Affect system-immutable files/dirs
--force-uchange          # Affect user-immutable files/dirs
-g, --group              # Preserve group
--groupmap STRING        # Custom groupname mapping
-H, --hard-links         # Preserve hard links
-h, --help (*)           # Show this help (* -h is help only on its own)
-h, --human-readable     # Output numbers in a human-readable format
-i, --itemize-changes    # Output a change-summary for all updates
--iconv CONVERT_SPEC     # Request charset conversion of filenames
--ignore-errors          # Delete even if there are I/O errors
--ignore-existing        # Skip updating files that exist on receiver
--ignore-missing-args    # Ignore missing source args without error
--ignore-times, -I       # Don't skip files that match size and time
--include PATTERN        # Don't exclude files matching PATTERN
--include-from FILE      # Read include patterns from FILE
--info FLAGS             # Fine-grained informational verbosity
--inplace                # Update destination files in-place
-J, --omit-link-times    # Omit symlinks from --times
-k, --copy-dirlinks      # Transform symlink to dir into referent dir
-K, --keep-dirlinks      # Treat symlinked dir on receiver as dir
-L, --copy-links         # Transform symlink into referent file/dir
-l, --links              # Copy symlinks as symlinks
--link-dest DIR          # Hardlink to files in DIR when unchanged
--list-only              # List the files instead of copying them
--log-file FILE          # Override the "log file" setting
--log-file-format FMT    # Log updates using the specified FMT
-M, --dparam OVERRIDE    # Override global daemon config parameter
-m, --prune-empty-dirs   # Prune empty directory chains from file-list
-M, --remote-option OPT  # Send OPTION to the remote side only
--max-alloc SIZE         # Change a limit relating to memory alloc
--max-delete NUM         # Don't delete more than NUM files
--max-size SIZE          # Don't transfer any file larger than SIZE
--min-size SIZE          # Don't transfer any file smaller than SIZE
--msgs2stderr            # Output messages directly to stderr
--munge-links            # Munge symlinks to make them safe & unusable
-N, --crtimes            # Preserve create times (newness)
-n, --dry-run            # Perform a trial run with no changes made
--no-detach              # Do not detach from the parent
--no-implied-dirs        # Don't send implied dirs with --relative
--no-motd                # Suppress daemon-mode MOTD
--no-OPTION              # Turn off an implied OPTION (e.g. --no-D)
--numeric-ids            # Don't map uid/gid values by user/group name
-O, --omit-dir-times     # Omit directories from --times
-o, --owner              # Preserve owner (super-user only)
--only-write-batch FILE  # Like --write-batch but w/o updating dest
--open-noatime           # Avoid changing the atime on opened files
--out-format FORMAT      # Output updates using the specified FORMAT
--outbuf N|L|B           # Set out buffering to None, Line, or Block
-P                       # Same as --partial --progress
-p, --perms              # Preserve permissions
--partial                # Keep partially transferred files
--partial-dir DIR        # Put a partially transferred file into DIR
--password-file FILE     # Read daemon-access password from FILE
--port PORT              # Specify double-colon alternate port number
--preallocate            # Allocate dest files before writing them
--progress               # Show progress during transfer
--protocol NUM           # Force an older protocol version to be used
-q, --quiet              # Suppress non-error messages
-r, --recursive          # Recurse into directories
-R, --relative           # Use relative path names
--read-batch FILE        # Read a batched update from FILE
--remove-source-files    # Sender removes synchronized files (non-dir)
--rsync-path PROGRAM     # Specify the rsync to run on remote machine
-s, --protect-args       # No space-splitting; wildcard chars only
-S, --sparse             # Turn sequences of nulls into sparse blocks
--safe-links             # Ignore symlinks that point outside the tree
--size-only              # Skip files that match in size
--skip-compress LIST     # Skip compressing files with suffix in LIST
--sockopts OPTIONS       # Specify custom TCP options
--specials               # Preserve special files
--stats                  # Give some file-transfer stats
--suffix SUFFIX          # Backup suffix (default ~ w/o --backup-dir)
--super                  # Receiver attempts super-user activities
-T, --temp-dir DIR       # Create temporary files in directory DIR
-t, --times              # Preserve modification times
--timeout SECONDS        # Set I/O timeout in seconds
-U, --atimes             # Preserve access (use) times
-u, --update             # Skip files that are newer on the receiver
--usermap STRING         # Custom username mapping
-v, --verbose            # Increase verbosity
-V, --version            # Print the version + other info and exit
-W, --whole-file         # Copy files whole (w/o delta-xfer algorithm)
--write-batch FILE       # Write a batched update to FILE
--write-devices          # Write to devices as files (implies --inplace)
-x, --one-file-system    # Don't cross filesystem boundaries
-X, --xattrs             # Preserve extended attributes
-y, --fuzzy              # Find similar file for basis if no dest file
-z, --compress           # Compress file data during the transfer

unicode.txt

″ inches
× °… ﹤﹥


  Line separator / U+2028

✗ ✓█
⸻
‾
꞉ “” ‘ ’ A ∕ B ⁇ ⁈ ․ …
[ㅤ] Hangul filler (between braces)
€ (or ALT + SHIFT + 2)
↑↓←→⋮♥≡≢ λ ⇒ ⇐ ⇑ ⇓
😂👌
™ : Typed by holding opt+2

^ Control
⌥ Option
⌘ Command