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Shell Programming and Scripting
Necessity of shebang line
Post 302649395 by Scott on Thursday 31st of May 2012 09:36:09 AM
05-31-2012
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I am currently writing BASH shell scripts. I am using BASH on a Powerbook G4 running Leopard. Could somebody please explain the difference between
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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??
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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)
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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.
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If i am not using #! in my script. By default where will be my script running? (6 Replies)
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I see lot of ad-hoc shell scripts in our servers which don't have a shebang at the beginning .
Does this mean that it will run on any shell ?
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Hello All,
I was writing a Bash shell script that will be executed on both an AIX server (/usr/bin/ksh) and a SLES server (/bin/bash). The AIX server
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LEARN ABOUT DEBIAN
alien::package::rpm
Alien::Package::Rpm(3pm) User Contributed Perl Documentation Alien::Package::Rpm(3pm) NAME
Alien::Package::Rpm - an object that represents a rpm package DESCRIPTION
This is an object class that represents a rpm package. It is derived from Alien::Package. FIELDS
prefixes Relocatable rpm packages have a prefixes field. METHODS
checkfile Detect rpm files by their extention. install Install a rpm. If RPMINSTALLOPT is set in the environement, the options in it are passed to rpm on its command line. scan Implement the scan method to read a rpm file. unpack Implement the unpack method to unpack a rpm file. This is a little nasty because it has to handle relocatable rpms and has to do a bit of permissions fixing as well. prep Prepare for package building by generating the spec file. cleantree Delete the spec file. build Build a rpm. If RPMBUILDOPT is set in the environement, the options in it are passed to rpm on its command line. An optional parameter, if passed, can be used to specify the program to use to build the rpm. It defaults to rpmbuild. version Set/get version. When retreiving the version, remove any dashes in it. postinst postrm preinst prerm Set/get script fields. When retrieving a value, we have to do some truely sick mangling. Since debian/slackware scripts can be anything -- perl programs or binary files -- and rpm is limited to only shell scripts, we need to encode the files and add a scrap of shell script to make it unextract and run on the fly. When setting a value, we do some mangling too. Rpm maintainer scripts are typically shell scripts, but often lack the leading shebang line. This can confuse dpkg, so add the shebang if it looks like there is no shebang magic already in place. Additionally, it's not uncommon for rpm maintainer scripts to contain bashisms, which can be triggered when they are ran on systems where /bin/sh is not bash. To work around this, the shebang line of the scripts is changed to use bash. Also, if the rpm is relocatable, the script could refer to RPM_INSTALL_PREFIX, which is set by rpm at run time. Deal with this by adding code to the script to set RPM_INSTALL_PREFIX. arch Set/get arch field. When the arch field is set, some sanitizing is done first to convert it to the debian format used internally. When it's retreived it's converted back to rpm form from the internal form. AUTHOR
Joey Hess <joey@kitenet.net> perl v5.14.2 2011-08-05 Alien::Package::Rpm(3pm)