💻 Terminal Snippets

Variables

Strip the directory path from a shell variable string and leave the last part of the path (the filename)

$ FILE=${PATHTOFILE##*/}

Strip the file name from a shell variable string and leave the dir part of the path

$ DIR=${PATHTOFILE%/*}

Ediff shortcuts

Ediff shortcuts expand

a - apply changes from buffer A
b - apply changes from buffer B
d - keep both variants (A+B)
n - show next changes
p - show previous changes
r - recover the original difference region in buffer C
C-x o - change focused buffer window
v - scroll bottom
M-v - scroll up
q - end ediffing

$ base64

$ base64 -i IN_FILE_PATH -o OUT_FILE_PATH

Examples

$ base64 -i CertificateSigningRequest.certSigningRequest -o encodedbase64.txt

Encode string

 $ base64 -D <<< STRING

`base64 <<< LS0tLS1CRUdJTiBDRVJUSUZJ`

`$ base64 -D <<< STRING`
Decode string<br>

base64 -D <<< LS0tLS1CRUdJTiBDRVJUSUZJ== > file.bin

$ convert

Resize the image
$ convert image.png -resize 33% resized.png

$ echo

List all files matching pattern in current directory

 $ echo *.txt
 $ echo .*

$ git

Clean up submodules

$ git submodule foreach --recursive git clean -xfd
$ git submodule update -f --init --recursive --remote

Cherry pick diffs which are contained only in the ANY_BRANCH

$ git cherry -v master ANY_BRANCH > only-feature-chages.txt
$ git cherry-pick 64f0e89e718aa034704c5895f9de858afae9da97 f415a7d8c1599021761bab852109ef6389918...
$ git status
$ git cherry-pick --continue

Git find "string" in the history of diffs

$ git log -p -S string_for_searching

Git print diff between mybranch and master in the file 'myfile.cs'

$ git diff mybranch..master -- myfile.cs

Find the file in the history

$ git log --all --name-status  -- "**/filename.*"

Show the file changes in the commit

$ git show <SHA> -- <path-to-file>

Restore the file in the working copy

$ git checkout <SHA>^ -- <path-to-file>

Apply reverted changes from a commit

$ git show <SHA> -- <path-to-file> | git apply -3 --whitespace=fix -R

Add custom ssh identity file to the repository

$ git config core.sshCommand "ssh -i ~/.ssh/not_default_id_rsa -F /dev/null"

Log all particular file commits

$ git log --follow -- FILE_PATH

Revert 3 last commits in with one commit

$ git revert --no-commit HEAD~3..

$ hexdump

Generate 16 hex bytes

hexdump -vn16 -e'4/4 "%08X" 1 "\n"' /dev/urandom

Bash

Files editing

Display file changes in real time
$ tail -f FILE
Remove new line and escape " symbols in the file
$ cat ORIGINFILE.TXT | tr -d '\n' | sed 's/"/\\"/g' > NEWFILE.TXT
Find a string recursively at path
$ grep -ir SEARCHABLE_STRING PATH
$ grep -A NUMBER_OF_LINES_AFTER -ir SEARCHABLE_STRING PATH
Create a file from hex string
$ writehex 8ade18f6 00000001 00000000 51aabd81 > FILENAME.EXT
Сount characters in string
$ echo 'abc...1235abc..' | wc -c

$ zip

$ zip -er ZIP.zip file1 dir1 file2 - Zip files with password protecting

zip files in directory with the same name as parent dir

$ zip -erv "$(basename `pwd`).zip" production.*
$ Enter password:
$ Verify password:
$ rsync -v "$(basename `pwd`).zip" USER_NAME@SERVER:PATH && rm -rvf "$(basename `pwd`).zip"
$ Password:

$ swiftc

Compilte swift file with generating dSym file
$ swiftc -g file.swift
Run executable using lldb debugger
$ lldb file
Load dSym file
(lldb) add-dsym <PathTo.dSYM>
Print backtrace
(lldb) thread backtrace

$ find

Find files matched pattern *.ipa and extract to directory named filename.unz
$ find . -name '*.ipa' -exec sh -c 'unzip -d `basename {}`.unz {}' \;
Find files with matched patterh *.txt and copy to CGL-28825 directory
$ find ./UnitTests/ -name '*.txt' -exec sh -c 'cp {} CGL-28825/{}' \;
Find duplicated files in the directory
$ find . ! -empty -type f -exec md5 {} + | sort | uniq -d
Find in current folder the folders that were modified 182 days ago and delete them
$ find ./ -maxdepth 1 -type d -ctime +182 -exec rm -rfv {} \;
Find in current folder PNG images and remove alpha channel. Adds white color to background. Overwrites!
$ find . -name '*.png' -exec sh -c 'convert {} -background white -alpha remove -alpha off {}' \;
Find all Info.plist files and add new boolean false value
$ find ./ -name Info.plist -exec sh -c '/usr/libexec/PlistBuddy -c "Add :test bool false" {}' \;
$ find ./ -name Info.plist -exec sh -c '/usr/libexec/PlistBuddy -c "Add :my_key string \"\"" {}' \;
Find example
$ find ./ -type f -name '*.xib' -exec sed -i '' -e 's/<device[a-z=\"0-9_ ]*\/>/<device id=\"appleTV\" appearance=\"light\"\/>/g' {} +
Resize *.png images to size 800x600 and append to new file suffix 800x600.png
$ find ./ -name '*.png' -exec sh -c 'convert {} -resize 800x600! {}%.*_800x600.png' \; Find in Info.plist file and print 1 line After
$ find ./ios/ -name 'Info.plist' -exec sh -c 'grep -A 1 -ir receiver_id {}' \;
Find unique files in directory and copy in another
$ find ./ -type f -exec md5sum {} + | sort | awk '!c[substr($0, 1, 32)]++' | awk '{print $2}' | xargs -I _ cp _ another_dir
Find file in the current directory which contains the multiple strings STR1,STR2,STR3
$find ./ -type f -exec grep -l 'STR1' {} \; | xargs grep -l 'STR2' | xargs grep -l 'STR3'

$ ls

list files in one line
$ ls | tr "\n" " "

$ jq

Remove new lines from json
$ jq -c .
Pretty print JSON
$ jq '.'

$ sed

Find all *.txt files in dir and execute sed without backuping

$ find ./UnitTests/ -type f -name '*.txt' -exec sed -i '' -e 's/video_url_android/dash/g' {} +

Extract minor number from version

$ echo '1.2.3' | sed 's/\([0-9]\).[0-9].[0-9]/\1/'

Extract substring "Bench press" from a string "title": "Bench press"

$ echo '"title": "Bench press"' | sed -ne 's/"title": \([a-z]+\)*//p'


`[[:space:]]*`	match the whitespace characters `<tab>` and `<space>`

Extract version from podspec file

$ sed -rn "s/.*([0-9]+\.[0-9]+\.[0-9]+).*/\1/p" [FILE].podspec

Replace string from the stdin input

$ sed 's/\&amp;/\&/g'

Replace digits A0 to "A0",

$ pbpaste| sed 's/\([0-9A-F][0-9A-F]\) /"\1",/g'

$ pbpaste| sed 's/\([0-9A-F]\{2,3\}\)[[:space:]]\{0,1\}/"\1",/g'

Convert md5 sum string to list of bytes in hex format

md5 -q Tests/Resources/1Mb | sed 's/\([0-9a-z][0-9a-z]\)/0x\1,/g'

$ top

Run top in non-interactive(batch) mode
$ top -l 1

$ clang

Compile single main.m file to executable prog
$ clang -fobjc-arc main.m -o prog1

$ printf

Tool for formatted output
$ printf '%-10.10s = %4.2f\n' 'Gigahertz' 1.92735

$ curl

Download and find and count occurances of regex_pattern in response (by adding new line \\\n)

$ curl  -v --silent 'http://awesome.com' 2>&1 | sed $'s/regex_pattern/regex_pattern\\\n/g' | grep -c 'regex_pattern'

An example with query parameters

curl -X POST -H "Accept: application/json" -H "Authorization: Basic xxxxxxxx" -H "Content-Type: application/x-www-form-urlencoded" --data          'grant_type=clone&refresh_token=xxx-xxx&scope=client'  'https://SERVER_URL'

$ grep

Extract substring from string:

$ grep -o -E '^[H](H|T|t)+-[0-9]{4}'

Extract 123 from versionCode 123

$ cat build.gradle | grep 'versionCode ' | grep -o -E '[0-9]+'

Extract "1.2.3" from versionName "1.2.3"

$ cat build.gradle | grep 'versionName ' | grep -o -E '\"[0-9].[0-9].[0-9]\"'

Extract URL from file

$ grep -o -E 'https://url.com/[?=;&_a-z0-9-]+' ../photos.txt

Exclude directories during search

$ grep --exclude-dir=Pods --exclude-dir=fastlane -ir 'https://' ./

Find multiple patterns

$ grep -e 'pattern1' -e 'pattern2' file

$ nc

Establish socket connection

nc IP PORT

$ telnet

Establish socket connection

telnet IP PORT

$ nettop

Listen the socket connection created by process with PID

nettop -n -p PID

$ rsync

Sync images(png, PNG, jpg, JPG) in 2 local folders

$  rsync -r --include="*.[Jj][Pp][Gg]" --include="*.[Pp][Nn][Gg]" --include="*/" --exclude="*" -av --progress FromDir1/ ToDir2/

Formatting

Pretty print JSON string

$ echo '{"foo": "lorem", "bar": "ipsum"}' | python -m json.tool

echo $(python3 -c "import sys,json; print(json.load(sys.stdin)['fields']['summary'])" <<< ${RESPONSE})

Pretty print XML string

$ echo '<root><foo a="b">lorem</foo><bar value="ipsum" /></root>' | xmllint --format -

Emacs

select region then M-| pbcopy RET - copy from Emacs to OS X clipboard
M-x hexl-find-file - editing binary files (delete-window)
M-x hexl-mode - translate an existing buffer into hex

Git-Emacs

m - mark the file the cursor is on ATM
M - mark all files in buffer
u/DEL - unmark file below/above
R - resolve conflicts during merge
a - add file to repository
r - remove file
i - add file to ignore list
c - commit
U - Undo -> revert file
l - see log file
g - refresh the status buffer
q - quit status buffer
? - get help!

Emacs-Magit

M-x magit-process-buffer - to show the output of recently run git commands
M-x magit-section-cycle-diffs - to expand all diffs
l-l b-b - checkout selected commit in history

Midnight Commander

ESC+o - open directory in another panel

Xcode. Setup template commands

Rename class prefix occurances in the folder.

$ find ./ -type f -exec sed -i "" -e 's/CLConfirmLogout/___VARIABLE_productName:identifier___/g' {} \;

Xcode debugger

Update view on debug

// stash a view (0x7f84c74ca870 address)
(lldb) e UIView *$cell = (UIView *)[0x7f84c74ca870 superview]
// set a new frame
(lldb) e (void)[$cell setFrame:(CGRect){0.f, 324.f, 10.f, 54.f}]
// set a new frame
(lldb) e (void)[$cell setFrame:(CGRect){0.f, 324.f, 10.f, 54.f}]
// update
(lldb) caflush frame

Examining Variables

Show the contents of the local variable bar formatted as hex.

(lldb) frame variable --format x bar
(lldb) fr v -f x bar

FFMPEG

Cut video of [duration]

$ ffmpeg -ss [start] -i in.mp4 -t [duration] -c copy out.mp4

Create gif image from movie

$ ffmpeg -ss 30 -t 3 -i input.mp4 -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" -loop 0 output.gif

This example will skip the first 30 seconds (-ss 30) of the input and create a 3 second output (-t 3).
fps filter sets the frame rate. A rate of 10 frames per second is used in the example.
scale filter will resize the output to 320 pixels wide and automatically determine the height while preserving the aspect ratio. The lanczos scaling algorithm is used in this example.
palettegen and paletteuse filters will generate and use a custom palette generated from your input. These filters have many options, so refer to the links for a list of all available options and values. Also see the Advanced options section below.
split filter will allow everything to be done in one command and avoids having to create a temporary PNG file of the palette.
Control looping with -loop output option but the values are confusing. A value of 0 is infinite looping, -1 is no looping, and 1 will loop once meaning it will play twice. So a value of 10 will cause the GIF to play 11 times. More info http://blog.pkh.me/p/21-high-quality-gif-with-ffmpeg.html

Name		Name	Last commit message	Last commit date
Latest commit History 204 Commits
bash		bash
bin		bin
App signing management.md		App signing management.md
LICENSE		LICENSE
README.md		README.md
Xcode.md		Xcode.md
download_ipa.md		download_ipa.md
ediff.md		ediff.md
electron-app.md		electron-app.md
for-loop-with-files.sh		for-loop-with-files.sh
git.md		git.md
linux.md		linux.md
lldb snippets.md		lldb snippets.md
neovim.md		neovim.md
netcat.md		netcat.md
plist_keys_reader.py		plist_keys_reader.py
python.md		python.md
raspberrypi.md		raspberrypi.md
swiftc.md		swiftc.md
xcode-shortcuts.md		xcode-shortcuts.md

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Formatting

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Update view on debug

Examining Variables

FFMPEG

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