What is the function of the following lines at the top of a shell script file: Directory and Script?
The file starts like this:
What is the use of the first two lines in the script? What if I save the file without them? What will be the effect? They are not comments. Im very new to this, please help!
What is the use of the first two lines in the script? What if I save the file without them? What will be the effect? They are not comments. Im very new to this, please help!
The first line of a script should be the shebang #! which it says what program is supposed to run the script when you make the file executable and run it as ./script.sh
However the script can be run as: ksh script.sh
If you remove the shebang that's the only option you have.
Anything that starts with just a # (except the #!, when is the first line) will be ignored as commands. They are just human readable comments.
I am assuming that the following does not exist in your actual script, since that will be incorrect.
Note that your #!bin/ksh should be #!/bin/ksh if your ksh shell lives there.
Thank you for the quick reply. I have removed these lines from my code. But I see working scripts which have them. Its strange though, because I do get the error of command not found for these lines.
I believe that Directory: and Script: may be keywords in ksh93 used for creating libraries of scripts that can be loaded as shell built-ins.
Although in bash the command line:
will give you a diagnostic similar to:
that same command (and:
or:
for any other name) in ksh93 (at least the Korn shell on OS X with version information: sh (AT&T Research) 93u+ 2012-08-01) will print the current date and time.
Note that the standards specify that the name of a utility (and the name of a variable and several other names) is "a word consisting solely of underscores, digits, and alphabetics from the portable character set. The first character of a name is not a digit." So the standards allow shells to produce unspecified results when a utility name contains a colon. (It appears that ksh93 does assign some meaning to names ending with a colon [names containing a colon other than as the last character don't seem to be treated specially], but I haven't found any description of exactly what those results are intended to be in the man page.)
Some of you who have been around as long as I have may also remember that some early shells (pre-Bourne) used a string ending with a colon appearing at the start of a line as a label that could be jumped to with a:
command. I believe the Mashey shell was the 1st to deprecate the goto command and the Bourne shell was the first shell that did not include a goto command.
I want to make a config file which contain all the paths.
i want to read the config file line by line and pass as an argument on my below function.
Replace all the path with reading config path line by line and pass in respective functions.
how can i achieve that?
Kindly guide.
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if
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LINE
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LINE
LINE
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1. The problem statement, all variables and given/known data:
My problem is that when I made up a non-existing directory, it prints out "hiii". It didn't enter the first if statement. It works if my directory exist.
2. Relevant notes:
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The question is here:
http://farm9.staticflickr.com/8065/8217767191_2154e64904_b.jpg
My problem is that when I made up a non-existing directory, it prints out "hiii". It didn't enter the first if statement. It works if my directory exist.
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