04-28-2011
Thank you both. I too feel the ABCD is literal. I think mirni is correct about the overall behavior (as were you ddreggors with the exception of the print).
The twist in all of this is that this sed command has been used at the end of an extraction process, supposedly to remove lines that contain leading ABDC followed by a pipe, and trailing ABCD preceded by a pipe. And to print (p), everything else to a .tmp file. Then a mv command was usedto overwrite the original file with the tmp file.
But when I run this command against a sample file created with the first 1000 lines of one of our prod files, the tmp file is empty each time. However when it runs in production the original file has the same byte count as the processed and renamed output file (as measured before the mv command is carried out). So print is working in prod.
The files are too big to diff though I compared the first 100K rows of the before and after to each other, and then the last 100K rows and came up with no differences each time. So in production it is writing every line to the tmp file, but when I run it it writes no lines to the tmp file.
My original intent was to change this over to a Perl pattern match and replace in the hopes of speeding up the process, but I wanted to understand the sed statement first. Now it's looking like at best sed is doing nothing, given that the before and after files are identical. But I still need to figure out why my tmp file is empty, using the same command (from the command line), while it prod the tmp file is the same size as the original file (when run from a script).
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LEARN ABOUT DEBIAN
nwbpset
NWBPSET(1) nwbpset NWBPSET(1)
NAME
nwbpset - Create a bindery property or set its value
SYNOPSIS
nwbpset [ -h ] [ -S server ] [ -U user name ] [ -P password | -n ] [ -C ]
DESCRIPTION
nwbpset Reads a property specification from the standard input and creates and sets the corresponding property. The format is determined by
the output of 'nwbpvalues -c'. nwbpset will hopefully become an important part of the bindery management suite of ncpfs, together with
'nwbpvalues -c'. See util/nwbpsecurity for an example.
As another example, look at the following command line:
nwbpvalues -t 1 -o supervisor -p user_defaults -c |
sed '2s/.*/ME/'|
sed '3s/.*/LOGIN_CONTROL/'|
nwbpset
With this command, the property user_defaults of the user object 'supervisor' is copied into the property login_control of the user object
'me'.
nwbpvalues -t 1 -o me -p login_control -c |
sed '9s/.*/ff/'|
nwbpset
This command disables the user object me.
Feel free to contribute other examples!
nwbpset looks up the file $HOME/.nwclient to find a file server, a user name and possibly a password. See nwclient(5) for more information.
Please note that the access permissions of $HOME/.nwclient MUST be 600 for security reasons.
OPTIONS
-h
-h is used to print out a short help text.
-S server
server is the name of the server you want to use.
-U user
user is the user name to use for login.
-P password
password is the password to use for login. If neither -n nor -P are given, and the user has no open connection to the server, nwbpset
prompts for a password.
-n
-n should be given if no password is required for the login.
-C
By default, passwords are converted to uppercase before they are sent to the server, because most servers require this. You can turn off
this conversion by -C.
AUTHORS
nwbpset was written by Volker Lendecke. See the Changes file of ncpfs for other contributors.
nwbpset 8/7/1996 NWBPSET(1)