Category: Shell

执行命令行的时候，希望本条操作不保留历史命令，设置

echo $HISTCONTROL
export HISTCONTROL=ignoreboth

然后执行命令

 export token=12xx

history 应该不显示在首字符是空格的命令

Usage: mktemp [OPTION]... [TEMPLATE]
Create a temporary file or directory, safely, and print its name.
TEMPLATE must contain at least 3 consecutive 'X's in last component.
If TEMPLATE is not specified, use tmp.XXXXXXXXXX, and --tmpdir is implied.
Files are created u+rw, and directories u+rwx, minus umask restrictions.

  -d, --directory     create a directory, not a file
  -u, --dry-run       do not create anything; merely print a name (unsafe)
  -q, --quiet         suppress diagnostics about file/dir-creation failure
      --suffix=SUFF   append SUFF to TEMPLATE; SUFF must not contain a slash.
                        This option is implied if TEMPLATE does not end in X
  -p DIR, --tmpdir[=DIR]  interpret TEMPLATE relative to DIR; if DIR is not
                        specified, use $TMPDIR if set, else /tmp.  With
                        this option, TEMPLATE must not be an absolute name;
                        unlike with -t, TEMPLATE may contain slashes, but
                        mktemp creates only the final component
  -t                  interpret TEMPLATE as a single file name component,
                        relative to a directory: $TMPDIR, if set; else the
                        directory specified via -p; else /tmp [deprecated]
      --help     display this help and exit
      --version  output version information and exit

GNU coreutils online help: 
For complete documentation, run: info coreutils 'mktemp invocation'

生成随机值

mktemp -u | awk -F'/' '{print $NF}'

for i in `seq 0 15`
do
letter=$(printf '%#x' $i | sed -e 's/0x//g')
echo $letter
done

yum install zip unzip

ubuntu使用unzip解压会出现乱码，加上-O参数就不会有乱码了,后面可接编码号如 gb2312 CP936  GBK GB18030

unzip -O gb2312 材料.zip

不解压查看zip文档的内容

unzip -v file1.zip

解压到指定目录下(如果没有会新建目录)

unzip terraform_0.12.29_darwin_amd64.zip -d terraform_0.12.29

http://zeuscn.net/archives/2012/12/25/ubuntu-linux-zip-command.html