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+# 常用SHELL命令
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+
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+推荐使用zsh： <http://ohmyz.sh/>
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+
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+## 查看磁盘可用空间
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+
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+```bash
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+df -h
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+```
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+
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+> -h, --human-readable print sizes in human readable format (e.g., 1K 234M 2G)
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+
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+```
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+Filesystem Size Used Avail Use% Mounted on
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+/dev/sda4 321G 1.4G 304G 1% /
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+none 4.0K 0 4.0K 0% /sys/fs/cgroup
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+udev 16G 4.0K 16G 1% /dev
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+tmpfs 3.2G 968K 3.2G 1% /run
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+none 5.0M 0 5.0M 0% /run/lock
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+none 16G 0 16G 0% /run/shm
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+none 100M 0 100M 0% /run/user
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+/dev/sda2 185M 75M 102M 43% /boot
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+/dev/sda5 28G 916M 26G 4% /var
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+/dev/sda6 184G 1.7G 173G 1% /usr
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+/dev/sda7 234G 1.4G 221G 1% /home
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+/dev/sda1 94M 2.6M 91M 3% /boot/efi
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+```
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+
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+## 查看内存使用
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+
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+```bash
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+free -m
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+```
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+
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+> -b,-k,-m,-g show output in bytes, KB, MB, or GB
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+
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+```
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+ total used free shared buffers cached
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+Mem: 32105 1503 30602 0 223 631
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+-/+ buffers/cache: 648 31457
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+Swap: 61034 0 61034
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+```
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+
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+## 性能分析
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+
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+```bash
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+top
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+```
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+
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+```
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+top - 11:13:36 up 12 days, 14:00, 3 users, load average: 0.02, 0.03, 0.05
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+Tasks: 211 total, 1 running, 210 sleeping, 0 stopped, 0 zombie
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+Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
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+Mem: 32876316k total, 1535196k used, 31341120k free, 229204k buffers
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+Swap: 62499836k total, 0k used, 62499836k free, 646796k cached
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+
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+ PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
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+```
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+
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+常用操作：
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+
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+```bash
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+top #//每隔5秒显式所有进程的资源占用情况
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+top -d 2 #//每隔2秒显式所有进程的资源占用情况
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+top -c #//每隔5秒显式进程的资源占用情况，并显示进程的命令行参数(默认只有进程名)
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+top -p 12345 -p 6789 #//每隔5秒显示pid是12345和pid是6789的两个进程的资源占用情况
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+top -d 2 -c -p 123456 #//每隔2秒显示pid是12345的进程的资源使用情况，并显式该进程启动的命令行参数
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+```
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+
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+## 搜索文件
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+
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+```bash
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+find . -name *.log #//在当前目录下查找.log日志
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+```
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