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Full Discussion: Uli101 assignment 2
Homework and Emergencies Homework & Coursework Questions Uli101 assignment 2 Post 302479340 by vbe on Friday 10th of December 2010 10:51:59 AM
Old 12-10-2010
There is no script to see what error you have...
@tcindy:
Code:
tag=$(tail -c 128 $path)

bad...
Code:
TAG=$(echo $PATH|tail -c64)

good...
Q: Why dont you test line by line to see why you have errors? Here your first initialization doesn't work:
(bash on aix6.2...)
Code:
 $ tail -c 32 $PATH
/usr/bin:/usr/dt/bin:/usr/dt/contrib/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/usr/lbin:/sbin:/usr/local/bin:/usr/vac/bin:/opt/freeware/bin:/opt/sas/9.2/SASFoundation/9.2:/usr/java5/bin:/usr/java5/jre/bin:/prd/app/menu:/prd/app/utl:/home/vbe/scripts:/home/vbe/bin:.: A file or directory in the path name does not exist.
an12:/sm/cron/bin $ tail -c64 < $PATH
bash: /usr/bin:/usr/dt/bin:/usr/dt/contrib/bin:/etc:/usr/sbin:/usr/ucb:/usr/bin/X11:/usr/lbin:/sbin:/usr/local/bin:/usr/vac/bin:/opt/freeware/bin:/opt/sas/9.2/SASFoundation/9.2:/usr/java5/bin:/usr/java5/jre/bin:/prd/app/menu:/prd/app/utl:/home/vbe/scripts:/home/vbe/bin:.: A file or directory in the path name does not exist.
an12:/sm/cron/bin $ TAG=$(echo $PATH|tail -c64)
an12:/sm/cron/bin $ echo $TAG
in:/prd/app/menu:/prd/app/utl:/home/vbe/scripts:/home/vbe/bin:.

 

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getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME
getusershell, setusershell, endusershell - get legal user shells SYNOPSIS
#include <unistd.h> char *getusershell(void); void setusershell(void); void endusershell(void); DESCRIPTION
The getusershell() function returns a pointer to a legal user shell as defined by the system manager in the file /etc/shells. If /etc/shells does not exist, the following locations of the standard system shells are used in its place: /bin/bash /bin/csh /bin/jsh /bin/ksh /bin/pfcsh /bin/pfksh /bin/pfsh /bin/sh /bin/tcsh /bin/zsh /sbin/jsh /sbin/pfsh /sbin/sh /usr/bin/bash /usr/bin/csh /usr/bin/jsh /usr/bin/ksh /usr/bin/pfcsh /usr/bin/pfksh /usr/bin/pfsh /usr/bin/sh /usr/bin/tcsh /usr/bin/zsh /usr/xpg4/bin/sh The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells. The setusershell() function rewinds the file or the list. The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells. RETURN VALUES
The getusershell() function returns a null pointer on EOF. BUGS
All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved. SunOS 5.10 30 Aug 2004 getusershell(3C)
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