System i: Programming i5/OS PASE - IBM

Example 1
In this example, the shell does a character comparison of the generic name prefix against what is
returned by readdir(). However, the QSYS.LIB file system returns directory entries in uppercase, so none
of the entries matches the lowercase generic name prefix.
$ ls -d /qsys.lib/v4r5m0.lib/qwobj*
/qsys.lib/v4r5m0.lib/qwobj* not found
$ ls -d /qsys.lib/v4r5m0.lib/QWOBJ*
/qsys.lib/v4r5m0.lib/QWOBJ.FILE
Example 2
This example is similar to the first example except that, in this case, the find utility is doing the
comparison, and not the shell.
$ find /qsys.lib/v4r5m0.lib/ -name 'qwobj*' -print
$ find /qsys.lib/v4r5m0.lib/ -name 'QWOBJ*' -print
/qsys.lib/v4r5m0.lib/QWOBJ.FILE
Example 3
The ps utility expects user names to be case-sensitive and therefore does not recognize a match between
the uppercase name specified for the -u option and lowercase names returned by the i5/OS PASE
runtime function getpwuid():
$ ps -uTIMMS -f
UID PID PPID C STIME TTY TIME CMD
$ ps -utimms -f
UID PID PPID C STIME TTY TIME CMD
timms 617 570 0 10:54:00 - 0:00 /QOpenSys/usr/bin/-sh -i
timms 660 617 0 11:14:56 - 0:00 ps -utimms -f
Related information
File system comparison
Line-terminating characters in integrated file system files
The AIX and i5/OS operating systems use different line-terminating characters in text files; for example,
in files and shell scripts.
The AIX applications that are the source for your i5/OS PASE programs expect that lines (for example, in
files and shell scripts) will end with a line feed (LF). However, PC software and typical i5/OS software
often ends lines with a carriage return and line feed (CRLF).
awk '{ gsub( /\r$/, "" ); print $0 }' < oldfile > newfile
CRLF used with FTP
One example of where this difference can cause problems is when you use File Transfer Protocol (FTP) to
transfer source files and shell scripts from the AIX operating system to the i5/OS operating system. The
FTP standard calls for data sent in text mode to use carriage return and line feed (CRLF) at the end of a
line. On AIX, the FTP utility removes carriage returns (CRs) when it processes an inbound file in text
mode. i5/OS FTP always writes exactly what is presented in the data stream and always retains CRLF for
text mode, which causes problems with the i5/OS PASE run time and utilities.
Where possible, use binary mode transfer from an AIX operating system to avoid this problem. Text files
transferred from personal computers will, in most cases, have CRLF delimiting lines in the file.
Transferring the files first to AIX will correct the problem. The following command can be used as a
means to remove the CR from files in the current directory:
awk '{ gsub( /\r$/, "" ); print $0 }' < oldfile > newfile
i5/OS PASE 15