logic statement symbols

In other languages, we often see logical symbols appearing in judgment statements, such asif (a| | b) {}But in some JS-related questions or books, we sometimes see logic with && and logic or | | The symbol appears in an assignment statement or in a

I. wildcard characters * Represents any character ranging from 0 to infinite. Example: Find the file name starting with cron under/etc/ [Root @ instructor Desktop] # ls/etc/cron * /Etc/cron. deny/etc/crontab /Etc/cron. d: 0 hourly raid-check

Source: http://blog.sina.com.cn/s/blog_62a151be0100x9rn.htmlFourth chapter basic Skills-Special symbolsThe quickest way to learn to write script is to watch someone else's script file. However, although this method is practical, it is often "less

The case statement is suitable for applications that require multiple branching. The case Branch statement is formatted as follows: Case $ variable name inMode 1)Command sequence 1;;Mode 2)Command Sequence 2       ;;*)Sequence of commands executed

1 ,@Generally, a command or statement is followed by a command. The command or statement itself is not displayed on the screen. Save the following code as the test. cmd file and run it to compare the output differences between the two echo

Linux special symbols Common special symbols in shell are listed as follows:#;.,/\ 'String' |! $ {}$? $ * "String "***? : ^ $ # $ @ 'COMMAND '{} [] [[] () | & {xx, yy, zz ,...}~ ~ + ~ -& \ +-% =! =   # Comments)This is almost a full-market symbol,

The special symbols commonly used in the shell are listed below:# ; ;; .   ,/\ \ ' String ' |! $   ${}   $? $$   $*\ "string\" * * *? : ^ $# [email protected] ' command ' {} [] [[]] () (())|| && {Xx,yy,zz,...} ~ ~+ ~-& \\ +-%= = = =# pound (comments)

Linux special symbols Common special symbols in shell are listed as follows: #;.,/\ 'String' |! $ {}$? $ * "String "***? : ^ $ # $ @ 'COMMAND '{} [] [[] () | & {XX, YY, ZZ ,...}~ ~ + ~ -& \ +-% =! =   # Comments)This is almost a full-market symbol,

Common special symbols in shell are listed as follows: #;., // 'String' |! $ {}$? $ * "String "***?: ^ $ # $ @ 'COMMAND '{} [] [[] () | & {XX, YY, ZZ ,...}~ ~ + ~ -&/ +-% =! = Output/input redirection>>>&> 2 &> 2 <>>&> & 2 # Comments)This is

Common special symbols in shell are listed as follows:#;.,/\ 'String' |! $ {}$? $ * "String "***? : ^ $ # $ @ 'COMMAND '{} [] [[] () | & {XX, YY, ZZ ,...}~ ~ + ~ -& \ +-% =! = Output/input redirection>>>&> 2 &> 2 <>>&> & 2 # Comments)This is