shell
See 100 linux shell questions.
Function to reduce duplication of code.
Shell is a collection of system commands
The first line starts with #!/bin/bash
#!/bin/bash
echo “123”
w
ls
Sp
PowerShell foundation
Windows powershell is a command-line shell and scripting environment, which is built into the operating system of win7 and above, so that command-line users and script writers can take advantage of
Shell, Python time function summary
Sometimes it is necessary to write some timed task scripts, a brief summary, memos.
>>> import datetime
>>> datetime.datetime.now()
datetime.datetime(2018, 5, 23, 17, 16, 33, 61000)
>>> print
Configure the YUM source and operate with YUM
Yum (full name Yellow dog Updater, Modified) is based on RPM package management. It can automatically download and install RPM packages from a specified server, automatically handle dependencies, a
Fourth, CD YUM Source Construction
1, mount the optical drive
https:/ /www.cnblogs.com/healy/p/11428622.html
2 , Make network yum source files invalid
3, enter the configuration file view
4. Invalidate networ
N methods for shell mathematical calculation
let usage method [email protected]:/tmp# n1=5
[email protected]:/tmp# n2=10< br />[email protected]:/tmp# let result=n1+n2
[email protected]:/tmp# echo $result
15
[email protected]:/tmp# let n1++
[
WINDOW10 installed Oracle11G
Download the oracle11g installation file from the oracle official website. (Baidu cloud disk extraction code rk3e), 2 compressed packages, and select and unzip at the same time to get the folder.
Regular expressions – need to help regular expression matching blood type
I am trying to come up with a regular expression to help me validate the blood type field – it should only accept A [– ], B [– ], AB [–] and O [– ].
This is the regular expression I came up w
Regular expression – replacing characters in Perl
I am trying to double all the vowels in each word. For example:
$string=”if it rains, cover with umbrella”; This is the code I wrote, but I did not get the correct output.
$string=~s/a
Regular expression – what is the fastest way to determine the full URL from a relative URL (given basic URL)
I am currently using the module URI::URL to generate a complete URL from a relative URL; however, it does not run as fast as I hoped. Does anyone know of another approach possible Will be faster?