Bash 脚本杂项

[hanxi]

读取配置文件

比如配置文件是这样的：

token=abcd
enckey=xyz

function get_config() {
    echo $(awk -F "=" '/^'$1'/ {print $2}' $config)
}

token=$(get_config token)
enckey=$(get_config enckey)

输出多行字符串

function usage() {
    cat << EOF
Usage: xclip [OPTION] [FILE]...
Access an X server selection for reading or writing.

  -i, -in          read text into X selection from standard input or files
                   (default)
  -o, -out         prints the selection to standard out (generally for
                   piping to a file or program)
  -l, -loops       number of selection requests to wait for before exiting
  -d, -display     X display to connect to (eg localhost:0")
  -h, -help        usage information
      -selection   selection to access ("primary", "secondary", "clipboard" or "buffer-cut")
      -noutf8      don't treat text as utf-8, use old unicode
      -target      use the given target atom
      -version     version information
      -silent      errors only, run in background (default)
      -quiet       run in foreground, show what's happening
      -verbose     running commentary

Report bugs to <astrand@lysator.liu.se>
EOF
    exit 0
}

## 输出多行字符串到文件

```bash
cat > $config << EOF
token=$1
enckey=$2
EOF

加密解密字符串

echo -e "Hello World" | openssl enc -e -aes-256-cbc -k enckey > enc.tmp
cat enc.tmp | openssl enc -d -aes-256-cbc -k enckey

读取命令行参数

# xxx.sh [-i file] [-o]
oclip_type=copy
input_file='-'
while getopts ":i:o" o; do
    case "${o}" in
        i)
            input_file=${OPTARG}
            ;;
        o)
            oclip_type=paste
            ;;
        *)
            usage
            ;;
    esac
done

插入路径到 PATH 环境变量

#insert ~/.local/bin into $PATH
old_path_len=${#PATH}
sub_path=${PATH#$bin}
new_path_len=${#sub_path}
#echo $old_path_len
#echo $new_path_len
if [ $old_path_len -eq $new_path_len ]; then
    profile=$HOME/.bashrc
    touch $profile
    bin='$HOME/.local/bin'
    sed -i "\:export PATH=\$PATH\:$bin:d" $profile
    echo "export PATH=\$PATH:$bin" >> $profile
    . $profile
fi