added 10 new cheat sheets: finger git hdparm hexdump jot lynx rs sox sudo xev

sheets/finger

@@ -0,0 +1,9 @@
+# Produces a multi-line format displaying all of the information described for
+# the -s option as well as the user's home directory, home phone number, login
+# shell, mail status, and the contents of the files “.plan”, “.project”,
+# “.pgpkey” and “.forward” from the user's home directory.
+finger -s username
+
+# weather report in console (for nuremberg in this case)
+finger nuremberg@graph.no
+

sheets/git

@@ -0,0 +1,168 @@
+# To set your identity:
+git config --global user.name "John Doe"
+git config --global user.email johndoe@example.com
+
+# To set your editor:
+git config --global core.editor emacs
+
+# To enable color:
+git config --global color.ui true
+
+# To stage all changes for commit:
+git add --all
+
+# To stash changes locally, this will keep the changes in a separate changelist
+# called stash and the working directory is cleaned. You can apply changes
+# from the stash anytime
+git stash
+
+# To stash changes with a message
+git stash save "message"
+
+# To list all the stashed changes
+git stash list
+
+# To apply the most recent change and remove the stash from the stash list
+git stash pop
+
+# To apply any stash from the list of stashes. This does not remove the stash
+# from the stash list
+git stash apply stash@{6}
+
+# To commit staged changes
+git commit -m "Your commit message"
+
+# To edit previous commit message
+git commit --amend
+
+# Git commit in the past
+git commit --date="`date --date='2 day ago'`"
+git commit --date="Jun 13 18:30:25 IST 2015"
+# more recent versions of Git also support --date="2 days ago" directly
+
+# To change the date of an existing commit
+git filter-branch --env-filter \
+    'if [ $GIT_COMMIT = 119f9ecf58069b265ab22f1f97d2b648faf932e0 ]
+     then
+         export GIT_AUTHOR_DATE="Fri Jan 2 21:38:53 2009 -0800"
+         export GIT_COMMITTER_DATE="Sat May 19 01:01:01 2007 -0700"
+     fi'
+
+# To removed staged and working directory changes
+git reset --hard
+
+# To go 2 commits back
+git reset --hard HEAD~2
+
+# To remove untracked files
+git clean -f -d
+
+# To remove untracked and ignored files
+git clean -f -d -x
+
+# To push to the tracked master branch:
+git push origin master
+
+# To push to a specified repository:
+git push git@github.com:username/project.git
+
+# To delete the branch "branch_name"
+git branch -D branch_name
+
+# To make an exisiting branch track a remote branch
+git branch -u upstream/foo
+
+# To see who commited which line in a file
+git blame filename
+
+# To sync a fork with the master repo:
+git remote add upstream git@github.com:name/repo.git    # Set a new repo
+git remote -v                                           # Confirm new remote repo
+git fetch upstream                                      # Get branches
+git branch -va                                          # List local - remote branches
+git checkout master                                     # Checkout local master branch
+git checkout -b new_branch                              # Create and checkout a new branch
+git merge upstream/master                               # Merge remote into local repo
+git show 83fb499                                        # Show what a commit did.
+git show 83fb499:path/fo/file.ext                       # Shows the file as it appeared at 83fb499.
+git diff branch_1 branch_2                              # Check difference between branches
+git log                                                 # Show all the commits
+git status                                              # Show the changes from last commit
+
+# Commit history of a set of files
+git log --pretty=email --patch-with-stat --reverse --full-index -- Admin\*.py > Sripts.patch
+
+# Import commits from another repo
+git --git-dir=../some_other_repo/.git format-patch -k -1 --stdout <commit SHA> | git am -3 -k
+
+# View commits that will be pushed
+git log @{u}..
+
+# View changes that are new on a feature branch
+git log -p feature --not master
+git diff master...feature
+
+# Interactive rebase for the last 7 commits
+git rebase -i @~7
+
+# Diff files WITHOUT considering them a part of git
+# This can be used to diff files that are not in a git repo!
+git diff --no-index path/to/file/A path/to/file/B
+
+# To pull changes while overwriting any local commits
+git fetch --all
+git reset --hard origin/master
+
+# Update all your submodules
+git submodule update --init --recursive
+
+# Perform a shallow clone to only get latest commits
+# (helps save data when cloning large repos)
+git clone --depth 1 <remote-url>
+
+# To unshallow a clone
+git pull --unshallow
+
+# Create a bare branch (one that has no commits on it)
+git checkout --orphan branch_name
+
+# Checkout a new branch from a different starting point
+git checkout -b master upstream/master
+
+# Remove all stale branches (ones that have been deleted on remote)
+# So if you have a lot of useless branches, delete them on Github and then run this
+git remote prune origin
+
+# The following can be used to prune all remotes at once
+git remote prune $(git remote | tr '\n' ' ')
+
+# Revisions can also be identified with :/text
+# So, this will show the first commit that has "cool" in their message body
+git show :/cool
+
+# Undo parts of last commit in a specific file
+git checkout -p HEAD^ -- /path/to/file
+
+# Revert a commit and keep the history of the reverted change as a separate revert commit
+git revert <commit SHA>
+
+# Pich a commit from a branch to current branch. This is different than merge as
+# this just applies a single commit from a branch to current branch
+git cherry-pick <commit SHA1>
+
+# Undo last commit
+# If you want to nuke commit C and never see it again
+#    (F)
+# A-B-C
+#     ↑
+#   master
+git reset --hard HEAD~1
+
+# Undo last commit
+# If you want to undo the commit but keep your changes
+#    (F)
+# A-B-C
+#   ↑
+# master
+git reset HEAD~1
+

sheets/hdparm

@@ -0,0 +1,6 @@
+# get information about hard disks
+hdparm -I /dev/sda
+
+# perform timings of device/cache reads for benchmark and comparison purposes
+hdparm -tT /dev/sda
+

sheets/hexdump

@@ -0,0 +1,12 @@
+# side-by-side hexadecimal and ascii view of the first 128 bytes of a file
+hexdump -C -n128 /etc/passwd
+
+# Convert a binary file to C Array
+hexdump -v -e '16/1 "0x%02X, "' -e '"\n"' file.bin > hexarray.h
+
+# Convert a binary file to Shell code
+hexdump -v -e '"\\""x" 1/1 "%02x" ""'
+
+# Generate random MAC address
+hexdump -n6 -e '/1 ":%02X"' /dev/random|sed s/^://g
+

sheets/jot

@@ -0,0 +1,32 @@
+# prints 21 evenly spaced numbers increasing from -1  to  1
+jot 21 -1 1.00
+
+# Show the ASCII character set
+jot -c 128 0
+
+# strings xaa through xaz with
+jot -w xa%c 26 a
+
+# 20 random 8-letter strings are produced with
+jot -r -c 160 a z | rs -g 0 8
+
+# Infinitely many yes's may be obtained through
+jot -b yes 0
+
+# thirty ed(1) substitution commands applying to lines 2, 7, 12, etc.
+jot -w %ds/old/new/ 30 2 - 5
+
+# The stuttering sequence 9, 9, 8, 8, 7, etc. can be produced by suitable
+# choice of precision and step size, as in
+jot 0 9 -  -.5
+
+# Generate a file containing exactly 1024 bytes is created with
+jot -b x 512 > block
+
+# set tabs four spaces apart starting from column 10 and
+# ending in column 132
+expand   -`jot -s, - 10 132 4`
+
+# print all lines 80 characters or longer
+grep `jot -s "" -b . 80`
+

sheets/lynx

@@ -0,0 +1,10 @@
+# Dump $url, do not show links urls
+lynx -dump -nolist $url
+
+# Use lynx to run repeating website actions
+# For creating your keystroke file, use:
+#   lynx -cmd_log yourfile
+lynx -accept_all_cookies -cmd_script=/your/keystroke-file
+
+# convert html to text
+lynx -force_html -stdin -dump -nolist

sheets/rs

@@ -0,0 +1,9 @@
+# reshape data: number of rows and columns
+jot 36 | rs 4 9
+
+# 0 is a dummy value for either the row or column count
+# (4 columns)
+jot 36 | rs 0 4
+
+# transpose output
+jot 36 | rs -t 0 4

sheets/sox

@@ -0,0 +1,39 @@
+# sox
+# Sound eXchange: play, record and convert audio files.
+# Audio formats are identified by the extension.
+
+# Merge two audio files into one:
+sox -m ${input_audiofile1} ${input_audiofile2} ${output_audiofile}
+
+# Trim an audio file to the specified times:
+sox ${input_audiofile} ${output_audiofile} trim ${start} ${end}
+
+# Normalize an audio file (adjust volume to the maximum peak level, without clipping):
+sox --norm ${input_audiofile} ${output_audiofile}
+
+# Reverse and save an audio file:
+sox ${input_audiofile} ${output_audiofile} reverse
+
+# Print statistical data of an audio file:
+sox ${input_audiofile} -n stat
+
+# Increase the volume of an audio file by 2x:
+sox -v 2.0 ${input_audiofile} ${output_audiofile}
+
+# Changing sample rate of a file
+sox ${input_file} -r 16000 ${output_file}
+
+# Changing the Number of Channels
+# For example: convert mono audio files to stereo
+sox ${mono_wav} -c 2 ${stereo_wav}
+
+# Generate Different Types of Sounds
+# ${len} - length of audio to synthesize, hh:mm:ss.frac
+# ${freq} - frequencies at the beginning/end of synthesis in Hz
+# ${type} is one of sine, square, triangle, sawtooth, trapezium, exp, 
+#   [white]noise, pinknoise, brown-noise
+# sox -n synth ${len} ${type} ${freq}
+sox -r 8000 -n output.wav synth 3 sine 300-3300
+
+# Speed up the Sound in an Audio File
+sox input.wav output.wav speed 2.0

sheets/sudo

@@ -0,0 +1,29 @@
+# sudo
+# Execute a command as another user.
+
+# List of an unreadable directory:
+sudo ls /usr/local/scrt
+
+# To edit a file as user www:
+sudo -u www vi /var/www/index.html
+
+# To shutdown the machine:
+sudo shutdown -h +10 "Cya soon!"
+
+# To repeat the last command as sudo:
+sudo !!
+
+# Save a file you edited in vim
+:w !sudo tee > /dev/null %
+
+# Make sudo forget password instantly
+sudo -K
+
+# List your sudo rights
+sudo -l
+
+# Add a line to a file using sudo
+echo "foo bar" | sudo tee -a /path/to/some/file
+
+# run root shell
+sudo -i

sheets/xev

@@ -0,0 +1,3 @@
+# Show keycodes used by Xorg
+# start xev and show only the relevant parts:
+xev | awk -F'[ )]+' '/^KeyPress/ { a[NR+2] } NR in a { printf "%-3s %s\n", $5, $8 }'