一些常用的bash命令

ssh

ssh root@ip

1.http://www.ruanyifeng.com/blog/2011/12/ssh_remote_login.html 2.https://www.bennythink.com/ssh-1.html 3.http://skx926.com/2017/11/30/understanding-of-ssh/

scp

#复制远程机器的文件到本地
scp root@10.10.10.10:/opt/soft/nginx-0.5.38.tar.gz /opt/soft/

将本地机器发送到远程机器
scp timeline_01.json root@172.18.138.143:/Users/sw/Downloads

scp -r 选项表示复制目录

参考：

http://man.linuxde.net/scp

rsync

–bwlimit 限速

ifconfig

lsof -i

sed

将逗号替换为制表符

sed $'s/,/\t/g' a.txt

前面需要加$’ ‘,否则\t不会被解析

打印第10到20行

sed -n '10,20p' a.txt

find

grep

xargs

kill

kill -0 $pid 查看进程是否还在运行

参考： https://stackoverflow.com/questions/11012527/what-does-kill-0-pid-in-a-shell-script-do

ll

In the order of output;

-rwxrw-r--    1    root   root 2048    Jan 13 07:11 afile.exe

file permissions,

number of links,

owner name,

owner group,

file size,

time of last modification, and

file/directory name

File permissions is displayed as following;

first character is - or l or d, d indicates a directory, a line represents a file, l is a symlink (or soft link) - special type of file

three sets of characters, three times, indicating permissions for owner, group and other:

r = readable
w = writable
x = executable

参考： https://unix.stackexchange.com/questions/103114/what-do-the-fields-in-ls-al-output-mean

bash快捷键

^a^b
#将上一个命令第一个出现的a替换为b

!!:gs/a/b
#将上一个命令中所有的a全部替换为b  

数组操作

定义数组

learning_rate=(0.1 0.01 0.5 1)

数组长度

echo ${#learning_rate[@]}

切片

echo ${learning_rate[@]:1:3}

遍历

for lr in ${learning_rate[@]};do
    echo $lr
done

或者

for i in ${#learning_rate[@]};do
    echo ${learning_rate[$i]}

tar

单个文件压缩打包 tar czvf my.tar file1

多个文件压缩打包 tar czvf my.tar file1 file2,…

单个目录压缩打包 tar czvf my.tar dir1

多个目录压缩打包 tar czvf my.tar dir1 dir2

解包至当前目录：tar xzvf my.tar