《Lecture 1: Course Overview + The Shell (2020)》

6:04 shell prompt
6:32 curstermizing shell
7:03 $date
7:19 $echo
7:29 $echo hello
7:46 $echo “Hello world”
8:41
10:01 environment variable
10:17 $echo $PATH
11:01 $ which echo
12:30 relative path
12:50 $pwd (print working directory)
13:24 cd /home (change my directory)
13:58 dot
15:03 …/…/…/…/…/
16:20 $ls
17:15 ~ tild
17:36 - dash
20:09 d means directory
21:32 read, write, execute
24:32 mv (rename, move)
25:20 cp (copy from, to)
25:50 rm (remove)
26:15 rmdir, mkdir (remove directory, make directory)
26:50 man (manual)
27:55 Ctrl+L (clear shall)
28:30 input and output
29:30 $echo hello > hello.txt
29:59 $cat hello.txt
30:10 $cat < hello.txt
30:43 $cat < hello.txt > hello2.txt
31:15 $>>^C
31:50 pipe
32:20 tail
$tail -nl
$ls -l / | tail -nl
$ls -l / | tail -nl > ls.txt
33:35 curl
curl --head --silent google.com
curl --head --silent google.com | grep -i content-length
curl --head --silent google.com | grep -i content-length | cut --delimetr = ’ ’ -f2
36:39 $sudo (super user)
38:02 $cat brightness
$sudo echo 500 > brightness

“cd -”

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