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Top Forums Shell Programming and Scripting remove line feeds followed by character Post 302537199 by alister on Thursday 7th of July 2011 11:06:06 AM
Old 07-07-2011
Quote:
Originally Posted by birei
Code:
                                                                                                                      
/^;/ { H ; $ bl ; b }

In case you are interested in writing the most portable sed possible, using a semicolon after a branch command is not portable. With that syntax, the script may not work with most implementations. If portability is desired, it's best to use a newline after each branch command.

For fun, here's a sed solution which does not use branching. It's a bit shorter but not as clear as your approach (and probably not as efficient, since it unconditionally executes the substitute command for each line read).

Code:
sed -n '/^;/H; x; s/\n;/;/; x; /^;/!{x; 1!p;}; ${x;p;}'

Regards,
Alister
This User Gave Thanks to alister For This Post:
 

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yum(8)																	    yum(8)

NAME
yum - Yellowdog Updater Modified shell SYNOPSIS
yum shell [filename] DESCRIPTION
yum includes an interactive shell for conducting multiple commands or sets of commands during a single execution of yum. These commands can be issued manually or passed to yum from a file. The commands are much the same as the normal yum command line options. See here yum(8) for that information. There are a few additional commands documented below. config [argument] [value] args: debuglevel, errorlevel, obsoletes, gpgcheck, assumeyes, exclude If no value is given it prints the current value. If value is given it sets that value. repo [argument] [option] list: lists repositories and their status enable: enable repositories. option = repository id disable: disable repositories. option = repository id transaction [argument] list: lists the contents of the transaction reset: reset (zero-out) the transaction solve: run the dependency solver on the transaction run: run the transaction Examples The following are examples of using the yum shell. list available packagename* groupinfo 'Some Group' install foo remove bar update baz run That will list available packages matching the glob 'packagename*'. It will return information on the group 'Some Group' It will then queue the following commands into the transaction: install foo, remove bar, update baz. Then the 'run' command will resolve dependencies for the transaction commands and run the transaction. SEE ALSO
yum (8) http://yum.baseurl.org/ AUTHORS
See the Authors file included with this program. BUGS
There of course aren't any bugs, but if you find any, they should be sent to the mailing list: yum@lists.baseurl.org or filed in bugzilla. Seth Vidal yum(8)
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