BASH Snippet

自動找出mediaserver的pid,並印meminfo和該pid的memory map

while [ true ]

do

  top -n 1 | grep mediaserver

  cat /proc/meminfo

  cat /proc/`ps | grep -i mediaserver | awk {'print $2'}`/maps

  echo ' '

  echo ' '

done

顯示指定檔案的size和md5

#!/bin/bash

if [ "$#" -lt 1 ] || ! [ -f "$1" ]

then

    echo 'should assian a valid file';

    exit -1;

fi

file=$1

if [ -f "$file" ]

then

    fsize=`ls -l $file | awk {'print $5'}`;

    md5val=`md5sum $file | awk {'print $1'}`;

    echo "filename=$file size=$fsize md5sum=$md5val";

else

    echo "$file not found."

    exit -1;

fi

顯示環境變數PATH中的各個目錄

#!/bin/bash

(IFS=':'
idx=0
for p in $PATH;
do
  echo "PATH[$idx]=$p"
  idx=$((idx+1))
done)

產生短版日期

#!/bin/bash
echo "$(date +%y%m%d)"

2016/8/24執行時會產生結果160824

印出目前主機的login使用者

w

w -h # ignore table header

w -s # short format

w # show information

who

who -u # show login users

who -b # server last boot time




用ssh登入遠端主機時,查看我們登入所用的ip

echo $SSH_CLIENT | awk '{ print $1}'
w $USER | awk '{print $3}' | xargs | awk '{print $3}'