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Shell Programming and Scripting
A sed doubt - need explanation
Post 302237722 by Tytalus on Thursday 18th of September 2008 08:19:10 AM
09-18-2008
Quote:
replaces all "/" characters with "_" for every line that starts with "."
well...not quite...and you can see that by running it
...the fuller breakdown is:Code:
sed "s # substiute % # use % as delimiter, so we have %LHS%RHS% \([^.]\)/ # LHS i.e. pattern to work on - the \(..\) captures the interior pattern - which is [^.]\ i.e. anything that isn't a . , followed by the / % \1_ # this replaces what was in the brackes ( ), followed by a _ % g" # globally i.e. ./ won't match, but all other X/ will, and will get replaced on the RHS by X_
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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)