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
Tag: shell
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++
[
Shell script reception parameters
test.sh
#!/bin/bash
echo “Script name$0”
echo “The first parameter $1”
echo “The second parameter $2”
echo “The third parameter $3”
echo “The fourth parameter $4”
echo “The fifth parame
Shell exercise -20
Question requirements Write a greeting program that can output greetings to the user according to the current time of the system when it is executed. Assume that from midnight to noon is morning, n
Shell read-only variable
test.sh:
#!/bin/bash
myUrl=”http://www.google.com span>”
readonly myUrl
myUrl=”http://www.runoob.com span>” Output
bogon:Desktop macname $ ./test.sh
./test.sh: line 4: myUrl: reado
Record the special variables in the shell script
1. Special location variables
About the above related variables introduction , You can also refer to the man manual, execute the command “man bash”, and then search for the keyword “Special P
Shell – interactive input
Interactive input and for statement (8-15)
Interactive input
1, read Usage: The read command can define multiple variable values at the same time, and the input content can be used as
Shell-06 function
Shell-06 function #Write a script, use the chkconfig command, loop execution, and close all 5 levels of services
#!/bin/bash
name=`chkconfig –list | cut -d’ ‘ -f1`
for i in [name
Shell exercise-18
Question requirementsprompt the user to enter the name of the network card, and then we use the script to output the ip of the network card, we need to consider the following questions:
?
#!
GREP Find shell foundation
1, define a command alias that is effective for all users, for example: lftps=’172.168.0.1/pub’
echo “alias lftps=’172.168.0.1/pub'” >> /etc/bashrc && source /etc/bashrc 2, display all lines