Shulou(Shulou.com)06/01 Report--

Self-built calibration time yum install-y ntp uses ntpdate time.fudan.edu.cn to calibrate time

Some of the most common uses of date in scripts:

Date +% F xxxx-xx-xx

Date +% T xx:xx:xx

Date +% Y prints the year in four-digit format

Date +% y prints the year in two-digit format

Date +% m month

Date + d date

Date +% H hours

Date +% M minutes

Date +% S seconds

Date +% s timestamp

Date +% w week, if the result shows 0, it means Sunday

Sometimes a day's date is used in the script: date-d "- 2 days" +% F

Define the format of the variable as the variable name = the value of the variable. You need to add the'$'symbol when referencing the variable in the script, which is consistent with the custom variable described earlier in shell.

Mathematical calculations should be enclosed in [] and with a'$'on the outside.

-lt (less than),-gt (greater than),-le (less than or equal to),-ge (greater than or equal to),-eq (equal to),-ne (not equal).

Read-p "Please input a number:" x

Read-p "Please input another number:" y

Sum=$ [$xylene roomy]

Echo "The sum of the two numbers is: $sum"

The read command is used in such a place to interact with the user, taking the string entered by the user as the value of the variable. The script execution process is as follows:

There is a $0, but it represents the name of the script itself.

If judgment statement; then

Command

Fi

If judgment statement; then

Command

Else

Command

Fi

(a) appears in if1.sh

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