但稍微有难度的是shell里面的那些个符号，各种特殊的符号在我们编写Shell脚本的时候如果能够用的好，往往...
4.4. Escape Special Characters in Here String To escape special characters like $, , and `, we can enclose the string with the single quote instead of the double quote: cat<<<'Display special characters: $ ` \' If we enclose the here string with a single quote, variable expansion such ...
Enclosing characters in double quotes (‘"’) preserves the literal value of all characters within the quotes, with the exception of ‘$’, ‘`’, ‘\’, and, when history expansion is enabled, ‘!’. The characters ‘$’ and ‘`’ retain their special meaning within double quotes (see...
How to escape special characters in a Bash string in Linux? How to Get Bash Script’s Own Path How to find the disk where root / is on in Bash on Linux? Un-exporting an Exported Variable in Bash in LinuxLinux, Programming, TutorialBash, Bash shell, Command, Command line, debug, Docum...
In this example we declare simple bash variable and print it on the screen ( stdout ) with echo command. #!/bin/bash STRING="HELLO WORLD!!!" echo $STRING 1. 2. 3. Your backup script and variables: #!/bin/bash OF=myhome_directory_$(date +%Y%m%d).tar.gz ...
produces a result. The arithmetic operators that you’re already familiar with for addition (+), subtraction (-), and multiplication (*) work like you would expect them to. Notice that when doing multiplication you need to escape the star character, otherwise Bash thinks you’re trying to cr...
You could used double quotes around your command, and then use whatever single and double quotes you need inside provided you escape double ones.您可以在命令周围使用双引号,然后在内部使用所需的任何单引号和双引号,只要您避免使用双引号即可。
Interestingly, we can disable variable interpolation inside double quotes as well, if we use the \ escape character as a prefix to $: $ msg="Hello \$USER" $ echo $msg Hello $USERCopy Again, as we anticipated, Bash printed the literal value of the string and no variable interpolation occu...
Escaping Characters in Bash on Linux - Abstract Characters are used in source code, command lines, and the majority of computer interaction. The majority of characters, on the other hand, are not represented by keys on a standard keyboard, and many are n
If you need to use one of the wildcard characters as an ordinary character, you make it literal or "escape it" by prefacing it with a backslash. So, if for some reason you had an asterisk as part of a file name—something you should never do intentionally—you could search for it ...