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Full Discussion: Shell script code not really understandable for me
Top Forums Shell Programming and Scripting Shell script code not really understandable for me Post 302995396 by durden_tyler on Wednesday 5th of April 2017 11:22:18 AM
Old 04-05-2017
Quote:
Originally Posted by digioleg54
...
...
Code:
 DAYS=10
 print_usage() {
        echo "\n"
        echo "Usage: $PROG [-days] [-file|-dir] dir1 [ dir2 ... dirN]"
        echo "       This program will delete all file/directories that are beyond "
        echo "       'x days' old."
        echo "           -days      - This flag allows you to define x days [default:10]"
        echo "           -file|-dir - This flag allows one to remove files [default: directories]"
        echo "\n"
}
  
  
...
 ...

...
I don't understand, why case we check
Code:
$1

and try to set up type as file, link, dir, if
Code:
$1

is always DAYS
And why script is checking CODE]$1 [/CODE] as directory, when we definitely know that it is a number?
...
I think it is a generally accepted convention that square brackets ("[]") means the argument is optional.
So, in your script, only "dir1" is mandatory - the rest of the arguments are optional.
In other words, $1 will be a number if it is specified.

You could, alternatively, execute your script as such:
Code:
 /export/applications/dte/sh/clean_disk.sh /export/applications/dte/web/release

For such an invocation, dir1 is "/export/applications/dte/web/release"
and DAYS takes the default value of 10.
Which is the same as:
Code:
 /export/applications/dte/sh/clean_disk.sh -10 /export/applications/dte/web/release

(At least that is what the "print_usage" function tries to convey. I haven't really reviewed or tested your script to see if it actually does what it says it does.)
 

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LEARN ABOUT LINUX

set_color

set_color(1)							       fish							      set_color(1)

NAME

       set_color - set_color - set the terminal color

set_color - set the terminal color
   Synopsis
       set_color [-v --version] [-h --help] [-b --background COLOR] [COLOR]

   Description
       Change the foreground and/or background color of the terminal. COLOR is one of black, red, green, brown, yellow, blue, magenta, purple,
       cyan, white and normal.

       o -b, --background Set the background color

       o -c, --print-colors Prints a list of all valid color names

       o -h, --help Display help message and exit

       o -o, --bold Set bold or extra bright mode

       o -u, --underline Set underlined mode

       o -v, --version Display version and exit

       Calling set_color normal will set the terminal color to whatever is the default color of the terminal.

       Some terminals use the --bold escape sequence to switch to a brighter color set. On such terminals, set_color white will result in a grey
       font color, while set_color --bold white will result in a white font color.

       Not all terminal emulators support all these features. This is not a bug in set_color but a missing feature in the terminal emulator.

       set_color uses the terminfo database to look up how to change terminal colors on whatever terminal is in use. Some systems have old and
       incomplete terminfo databases, and may lack color information for terminals that support it. Download and install the latest version of
       ncurses and recompile fish against it in order to fix this issue.

Version 1.23.1							  Sun Jan 8 2012						      set_color(1)
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