Shell Script Annotation _linux Shell

I. Single-select annotations

Lines that begin with "#" are comments that are ignored by the interpreter.

Copy Code code as follows:

#--------------------------------------------
# This is a script that automatically plays IPA, based on Webfrogs's ipa-build writing:
# Https://github.com/webfrogs/xcode_shell/blob/master/ipa-build

# Features: Automatically packaged for Etao iOS app, 14-channel IPA package
# Features: Automatic packaging, no need to enter any parameters
#--------------------------------------------

##### User Configuration area starts #####
#
#
# project root directory, it is recommended to put this script in the root directory of the project, there is no need to change the
# application name to ensure consistency with the Target_name.app name under Xcode product
#
##### User Configuration area End #####

Two or more lines of comment

What if, during the development process, a large segment of code needs to be annotated temporarily and then canceled? Each line with a # symbol is too laborious, you can put this paragraph to annotate the code in a pair of curly braces, defined as a function, no place to call the function, the code will not be executed, to achieve the same effect as the annotation. Example:

Copy Code code as follows:

Notexce () {
CP./a.txt./b.txt
mkdir-p {1,2,3}/{4,5,6}
echo "OK"
}

But if we need to comment on a large segment of the shell script, if we all add the # in front of each line, which is really not a very comfortable thing for us, then, in the shell, there is no way to use a C-like annotation/* ... to achieve a whole paragraph of the annotation effect? The notes were tested and found that the following method was OK.

Copy Code code as follows:

: <<! Eof!
CP./a.txt./b.txt
mkdir-p {1,2,3}/{4,5,6}
echo "OK"
! Eof!

You can even turn the shell of the annotation into a function to achieve the goal of not allowing execution. As in Example 2.

To comment out the shell multiline, there are also the following methods:

The first: based here documents and: implementation, and example 3 similar

If there are inverted quotes in the annotated content, the error will be

Copy Code code as follows:

: <<block
.... Multiple lines of content being commented
Block

Troubleshoot problems with inverted quotes in comments

Copy Code code as follows:

:<< ' Block
.... Multiple lines of content being commented
Block '

Or simply leave a single quote

Copy Code code as follows:

:<< '
.... Multiple lines of content being commented
'

The second: when there are parentheses in the content of the Times syntax error, but there are inverted quotes, quotes without problems

Copy Code code as follows:

:|| {
.... Multiple lines of content being commented
}

Third: Error in syntax errors such as parenthesis quotes in annotation content

Copy Code code as follows:

If false; Then
.... Multiple lines of content being commented
Fi