This page is part of the web mail archives of SRFI 22 from before July 7th, 2015. The new archives for SRFI 22 contain all messages, not just those from before July 7th, 2015.
> > From: "Neil W. Van Dyke" <nwv@xxxxxxx> > > To: srfi-22@xxxxxxxxxxxxxxxxx > > > I'm pretty sure I've seen '90s-era workstation Unixen that don't > > tolerate a space between the "#!" cookie and the pathname to the > > I have seen '80s-era mini-super computers that only worked _with_ a space. > They read the first 4 bytes of a file to decide what to do with it. Rather than speculate about all the possible differences (/usr/bin/env vs. /bin/env, 32 character limit, space vs. no space), how about trying it out on a bunch of Unix implementations and reporting the results? Even if a standard exists and is documented somewhere, such a survey might point out that some implementations of Unix don't implement the standard correctly, or that all the "mainstream" Unix implementations support a particular style of script. For this purpose I have written the script attached below. Just put it in the file "testscript", type "source testscript" on the Unix implementations you have access to, and report the output (all temporary file are cleaned up). Here is the output for Linux (which is basically the same for MacOS X, i.e. /bin/env does not exist) % source testscript testscript 1.0 Linux trex.IRO.UMontreal.CA 2.2.19pre10 #2 SMP Mon Feb 12 14:21:35 EST 2001 i686 unknown Tue May 22 07:51:38 EDT 2001 -------------------- ./script1 #! /usr/bin/env cat -------------------- ./script2 #!/usr/bin/env cat -------------------- ./script3 #! /usr/bin/env cat #! /usr/bin/env ./script3-helper-file890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 -------------------- ./script4 #!/usr/bin/env cat #!/usr/bin/env ./script4-helper-file7890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 -------------------- ./script5 sh: ./script5: No such file or directory -------------------- ./script6 sh: ./script6: No such file or directory -------------------- ./script7 sh: ./script7: No such file or directory -------------------- ./script8 sh: ./script8: No such file or directory Marc --------------8<--------------8<--------------8<--------------8<-------------- sh <<EOF echo "testscript 1.0" uname -a date mkdir testscript-tmp cd testscript-tmp echo "#! /usr/bin/env cat" > script1 echo "#!/usr/bin/env cat" > script2 echo "#! /usr/bin/env ./script3-helper-file890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567" > script3 echo "#! /usr/bin/env cat" > script3-helper-file890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 echo "#!/usr/bin/env ./script4-helper-file7890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567" > script4 echo "#!/usr/bin/env cat" > script4-helper-file7890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 echo "#! /bin/env cat" > script5 echo "#!/bin/env cat" > script6 echo "#! /bin/env ./script7-helper-file4567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567" > script7 echo "#! /bin/env cat" > script7-helper-file4567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 echo "#!/bin/env ./script8-helper-file34567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567" > script8 echo "#!/bin/env cat" > script8-helper-file34567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 chmod 755 script1 script2 script3 script3-helper-file890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 script4 script4-helper-file7890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 script5 script6 script7 script7-helper-file4567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 script8 script8-helper-file34567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 echo -------------------- ./script1 ./script1 echo -------------------- ./script2 ./script2 echo -------------------- ./script3 ./script3 echo -------------------- ./script4 ./script4 echo -------------------- ./script5 ./script5 echo -------------------- ./script6 ./script6 echo -------------------- ./script7 ./script7 echo -------------------- ./script8 ./script8 rm -f script1 script2 script3 script3-helper-file890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 script4 script4-helper-file7890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 script5 script6 script7 script7-helper-file4567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 script8 script8-helper-file34567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567 cd .. rmdir testscript-tmp EOF --------------8<--------------8<--------------8<--------------8<--------------