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misc-shell-commands.md

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SOCKS Proxy

ssh -D 127.0.0.1:1080 remote_ssh_server

Opens port 1080 on your local machine as a SOCKS proxy so all your HTTP traffic can be specified to go through the SSH tunnel and out remote_ssh_server on the other end.

Local Port Forwarding

ssh -L 9000:localhost:5432 remote-server

Forwards port 5432 from the remote-server to port 9000 on localhost.

Remote Port Forwarding

ssh –R 12345:horse:80 goat

You can point your web browser to http://goat:12345, it will show the content as if you accessed http://horse. This time, you can only access port 12345 on goat (no Gateway port).

Check what's listening on a port

netstat -anp tcp | grep 3000

or

lsof -n -i:3000 | grep LISTEN

macOS command line updates

check XCode installed packages:

xcode-select -p

install command line tools:

xcode-select --install

see all options

softwareupdate -h

use the following syntax to download update but not install:

sudo softwareupdate -d nameHere
sudo softwareupdate -d iTunesXPatch-12.3.1

to cancel a download, enter:

sudo softwareupdate -e

all updates that are recommended for your system:

sudo softwareupdate -r

to install all updates that are applicable to your system, enter:

sudo softwareupdate -i -a

to list available updates

softwareupdate --list
Software Update Tool
Copyright 2002-2015 Apple Inc.

Finding available software
Software Update found the following new or updated software:
   * Command Line Tools (macOS Sierra version 10.12) for Xcode-8.1
        Command Line Tools (macOS Sierra version 10.12) for Xcode (8.1), 123638K [recommended]

to install a specific update from the list

softwareupdate --install "Command Line Tools (macOS Sierra version 10.12) for Xcode-8.1"

misc. commands

Run the last command as root

sudo !!

Serve current directory tree at http://$HOSTNAME:8000/

python -m SimpleHTTPServer

python smtp server

python -m smtpd -n -c DebuggingServer localhost:1025

Runs previous command but replacing

^foo^bar

currently mounted filesystems in nice layout

mount | column -t

Execute a command at a given time

echo "ls -l" | at midnight

Quick access to the ascii table.

man ascii

output your microphone to a remote computer's speaker

dd if=/dev/dsp | ssh -c arcfour -C username@host dd of=/dev/dsp

Download an entire website

  • -p parameter tells wget to include all files, including images.
  • -e robots=off you don't want wget to obey by the robots.txt file
  • -U mozilla as your browsers identity.
  • --random-wait to let wget chose a random number of seconds to wait, avoid get into black list.

Other Useful wget Parameters:

--limit-rate=20k limits the rate at which it downloads files.

  • -b continues wget after logging out.

  • -o $HOME/wget_log.txt logs the output

    wget --random-wait -r -p -e robots=off -U mozilla http://www.example.com

Compare a remote file with a local file

ssh user@host cat /path/to/remotefile | diff /path/to/localfile -

Close shell keeping all subprocess running

disown -a && exit

quickly rename a file

mv filename.{old,new}

Display the top ten running processes - sorted by memory usage

ps aux | sort -nk +4 | tail

Watch Network Service Activity in Real-time

lsof -i

diff two unsorted files without creating temporary files

diff <(sort file1) <(sort file2)

Create a script of the last executed command

echo "!!" > foo.sh

Delete all files in a folder that don't match a certain file extension

rm !(*.foo|*.bar|*.baz)

Show apps that use internet connection at the moment. (Multi-Language)

lsof -P -i -n

Sharing file through http 80 port

nc -v -l 80 < file.ext

save command output to image

ifconfig | convert label:@- ip.png

Show File System Hierarchy

man hier

Kills a process that is locking a file.

fuser -k filename

more

Git defaults

Allow all Git commands to use colored output, if possible:

git config --global color.ui auto

Tell git-branch and git-checkout to setup new branches so that git-pull will appropriately merge from that remote branch. Recommended. Without this, you will have to add —track to your branch command or manually merge remote tracking branches with “fetch” and then “merge”.

git config --global branch.autosetupmerge true

Unqualified git merge to merge the current branch's configured upstream branch, rather than being an error. (git rebase always has this behaviour. Consistent!) You should still merge thoughtfully

git config --global merge.defaultToUpstream true

Default pushing to the current remote branch

git config --global push.default current

Alternatively, When pushing without giving a refspec, push the current branch to its upstream branch

git config --global push.default tracking

git examples

Amending commits

make the changes

git add <changed-file>
git commit --amend
git push -f

Rewriting Git commits

check the history

git log

rebase the last n commits interactively

git rebase -i HEAD~n

apply the changes

git rebase --continue

Undo commit head

git reset HEAD^

more, even more