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Shell Programming and Scripting
Scripts without shebang
Post 302694367 by Peasant on Thursday 30th of August 2012 12:58:56 PM
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1. Shell Programming and Scripting
Hi,
I am currently writing BASH shell scripts. I am using BASH on a Powerbook G4 running Leopard. Could somebody please explain the difference between
#!/bin/bash and #!/bin/sh?
I have been using the latter (#!/bin/sh), and things have been working fine. But is that the correct one to use... (9 Replies)
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2. Shell Programming and Scripting
Do we need to include the exclamatory mark in the shebang line??:confused:
What if we dont include it??:eek:
Actually what shebang line implies when we run a script??
shebang line--> #!/bin/ksh :p (6 Replies)
Discussion started by: nohup
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3. Shell Programming and Scripting
Can any one tell me how to replace a shebang line of a file using sed?
Eg: If a file contains the following shebang line
#!C:/InstantRails/ruby/bin/ruby
I would like to replace it with
#!/usr/local/bin/ruby
The shebang line of the file can be obtained from the command
cat... (3 Replies)
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*** EDIT: I found something close to my solution under an IIS 7 Module Handle.*****
(Non-Homework question, simply an ease of use one)
Odd question here and maybe its my newness to cgi/Perl, but is it possible to have 2 shebang lines?
I write an test a ton of my homework code on my windows... (1 Reply)
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5. Shell Programming and Scripting
Hi,
I always thought that #!/usr/bin/ksh means that the script would be executed in korn shell i.e. when we'll execute the script with this line as the very first line then the shell spawns a korn shell (in this case as we are using #!/usr/bin/ksh ) and the script gets executed.
But I am... (7 Replies)
Discussion started by: dips_ag
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6. Shell Programming and Scripting
Hi,
I have a trivial question to ask, I am seeing in some shell scripts the '-' (hyphen) character following the first line of shell script (i.e) the shebang notation as follows:
#!/bin/sh -
#! /bin/bash -
what does the hyphen signify? What will happen if it is not given explicitly? (2 Replies)
Discussion started by: royalibrahim
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If i am not using #! in my script. By default where will be my script running? (6 Replies)
Discussion started by: Kochu77
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What does the "-f" mean in following interpreter code
#!/bin/csh -f
Thank you (2 Replies)
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9. Shell Programming and Scripting
Hi ,
I know about the shebang line in shell scripting. Just want to know whether is there any difference in execution of the program by keeping and not keeping the shebang line. Because without shebang line also the script is working. correct me if am wrong. Any help on this will be helpful (5 Replies)
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LEARN ABOUT OPENDARWIN
su
SU(1) BSD General Commands Manual SU(1) NAME
su -- substitute user identity SYNOPSIS
su [-flm] [login] [-c shell arguments] DESCRIPTION
su requests the password for login and switches to that user and group ID after obtaining proper authentication. A shell is then executed, and any additional shell arguments after the login name are passed to the shell. If su is executed by root, no password is requested and a shell with the appropriate user ID is executed. The options are as follows: -c Invoke the following command in a subshell as the specified user. -f If the invoked shell is csh(1), this option prevents it from reading the ``.cshrc'' file. -l Simulate a full login. The environment is discarded except for HOME, SHELL, PATH, TERM, and USER. HOME and SHELL are modified as above. USER is set to the target login. PATH is set to ``/bin:/usr/bin''. TERM is imported from your current environment. The invoked shell is the target login's, and su will change directory to the target login's home directory. This option is identical to just passing "-", as in "su -". -m Leave the environment unmodified. The invoked shell is your login shell, and no directory changes are made. As a security precau- tion, if the target user's shell is a non-standard shell (as defined by getusershell(3)) and the caller's real uid is non-zero, su will fail. The -l and -m options are mutually exclusive; the last one specified overrides any previous ones. Only users in group ``wheel'' (normally gid 0) or group ``admin'' (normally gid 20) can su to ``root''. By default (unless the prompt is reset by a startup file) the super-user prompt is set to ``#'' to remind one of its awesome power. SEE ALSO
csh(1), login(1), sh(1), skey(1), kinit(1), kerberos(1), passwd(5), group(5), environ(7) ENVIRONMENT
Environment variables used by su : HOME Default home directory of real user ID unless modified as specified above. PATH Default search path of real user ID unless modified as specified above. TERM Provides terminal type which may be retained for the substituted user ID. USER The user ID is always the effective ID (the target user ID) after an su unless the user ID is 0 (root). HISTORY
A su command appeared in Version 7 AT&T UNIX. BSD
April 18, 1994 BSD