Tag Archives: linux

VIM-1.6 More VIM Shortcuts and Tips

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:v/^Binary/d – delete all lines that does not start with Binary
ctrl+w gf with cursor on a filename will open that file in a new tab
gf with cursor on a filename will close current file and open that file
press * with cursor on a word will search for that word in file
vim -p file1 file2 file3 file4 # opens these files in tabs
:tabonly – closes all other tabs except current one
vimdiff – when you press ‘do’, obtain any differences from the other window. ‘dp’ will put any differences to the other window
:sort u – sort unique in vim
:sort – regular sort in vim
vim scp://username@host/PATH – open remote files
ctrl+p – autocomplete
:’t,. !awk ‘{print $3 ” ” $2 ” ” $1}’ – execute awk on current opening file
:Explore – execute, delete, rename file system easily with vim
:earlier 2h – undo up to 2hours
:later 2h – redo up to 2hours
:set spell – turn on spell check for strings within quotes
:set nospell
shift + k – with cursor on a command, press that and see man page
!% – will execute current script

SHELL-1.1 Shell Script Introduction and Basics

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A shell script is basically a script that runs a bunch of unix commands along with conditional statements, loops statements. When programming shell script, space matters.
#!/bin/bash

# SETTING A VARIABLE
greeting=”Hello World”

# SETTING A GLOBAL/ENVIRONMENT VARIABLE
export blogname=”fuzicast”

# ASSIGN OUTPUT OF SUBSHELL TO VARIABLE
filenames=$(ls -ltr) # note that subshell inherits all environment variables from parent shell
no_of_files=`ls -ltr | wc -l`

# HOW TO CREATE MULTIPLE LINE COMMENT
<<COMMENT
The previous line begins a comment block, this is also known as HERE DOCUMENT
Here's another comment
The following line ends the comment block
COMMENT

# PERFORM ARITHMETIC CALCULATION
var1=45
var2=30
echo $[ $var1 + $var2 ]
(( sum=$var1 + $var2 ))
echo $sum

# IF STATEMENT
if [ $[ $var1 + $var2 ] -gt 70 ];then
echo "sum is greater than 70"
elif [ $[ $var1 + $var2 ] -lt 70 ];then
echo "sum is less than 70"
else
echo "unknown"
fi

# WHILE STATEMENT
var1=30
while [ $var1 -gt 0 ];do
echo "while \$var1 is greater than 0, keep running … "
var1=$[ $var1 – 1 ]
done

# UNTIL STATEMENT
var1=0
until [ $var1 -gt 30 ];do
echo "until \$var1 is greater than 30, keep running …"
var1=$[ $var1 + 1 ]
done

# FOR STATEMENT
for arg in $@;do
echo $arg
done

# CASE STATEMENT
var1=1
case $var1 in
1) echo "hello world"
echo "fuzicast video tutorials";;
2) echo "wrong option";;
3) echo "guess again";;
*) echo "Default option";;
esac

Fuzicast hits 5000+ views; New video on UNIX pipes and direction

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Wow, after a little more than 2 months since inception of the blog, fuzicast.com now has over 100+ subscribers (twitter, youtube, facebook, wordpress), 5000+ views on the blog and more than 4000+ views on Youtube videos. Is it worth for a celebration? I say yes! But above all, this couldn’t have been done without all the viewers and subscribers. Thank you for making this happen. More videos will be coming out this weekend to celebrate! =)

PS: If you like the blog, please feel free to share fuzicast.com with your friends and coworkers. Also make sure to subscribe to my channel for more videos on UNIX, Perl and SQL.
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UNIX-1.12 SSH Command

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ssh username@host – remote login to a remote host
ssh -i ssh-key username@hostname – using another key to ssh remote host
ssh-keygen -t rsa/dsa – generate ssh keys using either rsa or dsa encryption
sudo useradd -m username – create user with home directory created automatically
passwd username – change password for that user
sudo usermod username -s /bin/bash – set type of shell for user
~/.ssh/config – create this config file and add Host, User, Hostname and IdentityFile settings
Host alias_name
Hostname localhost
IdentityFile ~/.ssh/obama.key
User username
ssh-copy-id username@hostname – copy ssh public automatically to remote host
ssh username@hostname ‘remote-command’ – execute remote commands
ssh -F another_config_file username@hostname – specify different config file
ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no username@hostname – do not check for known hosts and add host key automatically to known_hosts file. since we set known_host file to /dev/null, new host key will be added to garbage file.

UNIX-1.11 zip, basename, mktemp, script and rcs commands

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zip -r filename.zip file1 file2 file3 – zip and compress files, recursively
unzip filename.zip – unzip a zip file
rmdir dirname – remove empty directory
basename fullpath – returns the file or directory name
dirname fullpath – returns the directory
mktemp – creates a temporary file and outputs temp filename
factor number – list the factors of a number
script -a script.out – starts recording your output screen, ctrl+D to stop recording
kill %% – kills previous command
sudo apt-get install rcs – to install linux revision control system (RCS)
mkdir RCS – create a directory called RCS to store all versions of file
ci script.sh – checks in a file, file is not readable until checked out
ci -u script.sh – checks in a file, file is visible for others to read
co -l script.sh – checks out a file, holds the lock.
co -lr1.1 script.sh – checks out a version of file, holds the lock
rcsdiff script.sh – compares current file with latest checked in version
rcsdiff -r1.1 -r1.2 script.sh – compares version 1.1 and 1.2
which command – tells you where such command resides in
locate keyword – searches for files or paths that contains keyword (that are accessible to you)

UNIX-1.10 Customize Command Prompt

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set -o vi – puts your command prompt into VI mode, allows you to execute VI commands
/command – search for command history, n for next match found, N for previous match found
PS1 – variable that holds text of your prompt
PS1=”\H” – displays host name
PS1=”\s” – name of shell
PS1=”\u” – current username
PS1=”\w” – current working directory
PS1=”\@” – current time
PS1=”[\\u@\\H \\W \\@]\\$” – try this
PS1=”\e[x;ym$PS1\e[m” – \e[ starts the color mode, x;ym specifys color, \e[m ends color mode. x;y can be 0;30 to 0;37
case $(id -u) in
0) PS1=”${PS1}# “;;
*) PS1=”${PS1}$ “;;
esac
alias name=”command -options” – creating alias/shortcut commands
alias vi=’vim’
alias ls=’ls -F’
alias ll=’ls -l’
alias la=’ls -la’
alias cp=’cp -ip’
alias mv=’mv -i’