edocs

change file extension

for f in *.txt; do
    mv -- "$f" "${f%.txt}.text"
done

if

if true; false; then echo hello; fi

if ls;cat ddd/; then echo hello; fi

• bash if sees 0 as a case to execute then block, very different from C lanaguage. this is simple because if a command run without error, the exit status is 0, as echo #? shows

• chown

chown peter: file
chown :peter file #this makes chgrp no longer useful

• http://www.catonmat.net/blog/top-ten-one-liners-from-commandlinefu-explained

• Run the last command as root

$ sudo !!

$ ^foo^bar^
$ !whatever:p # Ctr-r is a better way then this

• curl

  • ref: https://www.youtube.com/watch?v=APtOavXTv5M&t=177s

• ref

  • http://www.catonmat.net/blog/top-ten-one-liners-from-commandlinefu-explained
  • http://www.commandlinefu.com/commands/browse

• 下面是一些常用的 bash 代码片段

#!/bin/bash
# change all ii into bb for all files in $PWD
# like vim bufdo
for file in `find . -type f`
do
    sed -i 's/ii/bb/g' $file
done
#!/bin/bash

if [ "$(id -u)" = "0" ]; then
   echo "This script should NOT be run as root, exit" 1>&2
   exit 1
fi

cd ~/edocs
rm -rf *~
echo "junk files removed---------------------------done"
echo
echo -n "plz input commit msg: "
read -e MSG
echo -n "running git add"
git add .
echo  "---------------done"
git commit -a -m "${MSG:-defaut-msg}"

echo "git commit ------------done"
echo
echo -n "Want to push to remote master(Y/n): "
read AAA
#be sure to have a blank between "[" and "$AAA"
if [ "${AAA:-y}" = "y" ];then
	echo pushing ...
	git push
	echo ...done
else
	echo pass
fi
#!/bin/bash

i=1
i=$((i+1))
echo hello"$i"
while read line; do
echo $line # or whaterver you want to do with the $line variable
done < $1


#################################
#
#    big example
#
#################################

while read line; do
echo $line|grep ^./ &>/dev/null # serch the line that begins with "./", that is the filename

if [ $? -eq 0 ]
then
    filename=$line # if the line is a filename, then update filename
else
    echo  "this is not a filename"
fi

done < reversed

• 我安装 ubuntu 系统的之后的初始化脚本

clear
echo
echo "=== HI $USER, You are running on UBUNTU: " `lsb_release  -c -r`

echo """
 this script helps you install your essential tools, let's go
"""

sudo apt-get update # on a fresh system, this is a MUST
sudo apt-get -y install tig xclip git curl tree vim  openssh-server

config_ssh()
{
    ssh-keygen -t dsa
    echo -n "=== copying public key to clipboard..."
    echo "=== done"
    echo "=== now paste your public key to github->account->sshkey "
    echo "=== and press Enter to continue"
    read AAA
}

echo "=== now config ssh..."
if [ -f ~/.ssh/id_dsa ] || [ -f ~/.ssh/id_rsa]
then
    echo === old keys found
    echo "=== do nothing..."
else
    config_ssh
fi

config_git()
{
echo "=== configuring git ..."
echo """
[user]
    name = Peter Wang
    email = happypeter1983@gmail.com
[core]
    editor = vim
[alias]
    ci = commit -a -v
    co = checkout
    st = status
    br = branch
    throw = reset --hard HEAD
    throwh = reset --hard HEAD^
[color]
    ui = true
[push]
    default = current
""" >~/.gitconfig
echo "git config ... done!"
}
if [ -f ~/.gitconfig ] ;then
    echo -n ".gitconfig exsits, overwrite? (Y/n): "
    read AAA
    if [ "${AAA:-y}" = "y" ];then
        config_git
    fi
else
    echo -n "~/.gitconfig not found, create it? (Y/n): "
    read AAA
    if [ "${AAA:-y}" = "y" ];then
        config_git
    fi
fi

cd ~
rm -rf Music  Templates  Videos Public Pictures Documents  Downloads  examples.desktop # rm folders I do not love

config_vim()
{
    cd ~
    if [ -d peter-vim ]
    then
        rm -rf peter-vim
    fi
    git clone git@github.com:happypeter/peter-vim.git && mv peter-vim .vim \
    && cd .vim && git checkout peter-private
    cd ~
    rm -rf ~/.vimrc
    ln -s ~/.vim/vimrc ~/.vimrc
    sudo apt-get -y install ctags
}

if [ -d ~/.vim ] ;then
    echo -n "=== .vim exsits, replace? (Y/n): "
    read AAA
    if [ "${AAA:-y}" = "y" ];then
        rm -rf ~/.vim
        config_vim
    fi
else
    echo -n "=== ~/.vim not found, create it? (Y/n): "
    read AAA
    if [ "${AAA:-y}" = "y" ];then
        config_vim
    fi
fi

echo "gnome-terminal --full-screen" >~/ggg
sudo mv ~/ggg /bin/ # this may not work if you put it into ~/bin
chmod +x /bin/ggg



clone_github_repo()
{
    mkdir  ~/bin 2>/dev/null
    echo "git clone git@github.com:happypeter/'$1'" >~/bin/git_my_repo
    chmod +x ~/bin/git_my_repo
}

clone_github_repo
######################################
#
#to enable bash vi mode, we need to add the following to $HOME/.bashrc
#
#    set -o vi
#    bind -m vi-insert "\C-l":clear-screen
#
#and we may need to add this for vim launcing as well
#
#    alias e='vim'
#
# have this for .inputrc
#
#    set completion-ignore-case on
#    set completion-prefix-display-length 2
#