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*nix shell script symbols
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hi. I'm a newbie in shell scripting as well as the *nix OS.
I just wanna ask about the symbol #! that I saw in many shell script examples. For instance,
What's the meaning of $1, $2, $3 symbols?
and what does the symbol ~ (like in
I'm sorry if this question sounds stupid and if my English is bad. English isn't my native languange.
Please help..
I just wanna ask about the symbol #! that I saw in many shell script examples. For instance,
#!/bin/bash . What does the #! symbol means?What's the meaning of $1, $2, $3 symbols?
and what does the symbol ~ (like in
cd ~user_name ) means?I'm sorry if this question sounds stupid and if my English is bad. English isn't my native languange.
Please help..
Last edited by curi0x; Jul 6th, 2009 at 10:04 am.
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Join Date: Feb 2006
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#! is a built-in exec. The shell script is executed in the shell declared on this line.
$1 etc are the arguments provided on the command line (or provided on the function call when used inside a function)
~ means home directory.
And I hope this is not homework.
$1 etc are the arguments provided on the command line (or provided on the function call when used inside a function)
~ means home directory.
And I hope this is not homework.
Java Programmer and Sun Systems Administrator
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
no. this isn't homework. I saw it in the facebook's puzzle master discussion. I'm using windows, and never use *nix OS before. thanks for your help. 
by the way, I forgot to ask about $< and $@ symbol. Do you know what it means?
by the way, I forgot to ask about $< and $@ symbol. Do you know what it means?
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Join Date: Feb 2006
Posts: 2,354
Reputation:
Solved Threads: 252
Java Programmer and Sun Systems Administrator
----------------------------------------------
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
----------------------------------------------
Debugging is twice as hard as writing the code in the first place. Therefore, if you write the code as cleverly as possible, you are, by definition, not smart enough to debug it.
--Brian Kernighan
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Originally Posted by curi0x 
I just wanna ask about the symbol #! that I saw in many shell script examples. For instance, #!/bin/bash . What does the #! symbol means? http://en.wikipedia.org/wiki/Shebang_(Unix)
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