Commands tagged sed

This is a slightly modified version of http://www.commandlinefu.com/commands/view/4283/recursive-search-and-replace-old-with-new-string-inside-files (which did not work due to incorrect syntax) with the added option to sed inside only files named filename.ext

The original command doesn't work for me - does something weird with sed (-r) and xargs (-i) with underscores all over...

This one works in OSX Lion. I haven't tested it anywhere else, but if you have bash, gpg and perl, it should work.

Assuming a convention looking group file, this command will eject oldspiderman from the leagueofsuperfriends group and add newspiderman:

oldspiderman:x:551:

aquaman:x:552:

superman:x:553:

newspiderman:x:554:

leagueofsuperfriends:x:1000:superman,oldspiderman,superman,aquaman

I look at xkcd in my news reader, but it displays the image's title attribute only for a few seconds which makes reading the longer ones more challenging. So I use this to display it in my console.

Reference:

http://stackoverflow.com/a/4455706

It is often recommended to enclose capital letters in a BibTeX file in braces, so the letters will not be transformed to lower case, when imported from LaTeX. This is an attempt to apply this rule to a BibTeX database file.

DO NOT USE sed '...' input.bib > input.bib as it will empty the file!

How it works:

Apply the search-and-replace rule to lines that start (^) with zero or more white spaces (\s*), followed by any character ([...]) that is *NOT* a "@" or a "%" (^@%).

Search (s) for some stuff and replace by other stuff. Do that globally (g) for all matches in each processed line.

Matches at least one uppercase letter ([A-Z][A-Z]*) followed by a character that is EITHER not "}" and not a capital letter ([^}A-Z]) OR (|) it actually IS a "}", which is followed by "," at the end of the line ($).

Putting regular expressions in escaped parentheses (\( and \), respectively) allows to dereference the matched string later.

Replace the matched string by "{", followed by part 1 of the matched string (\1), followed by "}", followed by the second part of the matched string (\2).

I tried this with GNU sed, only, version 4.2.1.

Use optimized sed to big file/stream to reduce execution time

Use

insted of sed

Magic line will extract almost all possible archives from current folder in its own folders. Don't forget to change USER name in sudo command. sed is used to create names for folders from archive names w/o extension. You can test sed expression, used in this command:

If some archives can't be extracted, install packages:

Hope this will save a lot of your time. Enjoy.

Quietly get a webpage from wikipedia: curl -s

By default, don't output anything: sed -n

Search for interesting lines: /<tr valign="top">/

With the matching lines: {}

Search and replace any html tags: s/<[^>]*>//g

Finally print the result: p

Search and replace recursively. :-) Shorter and simpler than the others. And allows more terms:

replace old new [old new ...] -- `find -type f`

Catches some background colors missed by the highest rated alternative.

Useful for figuring out which services are lagging the boot time on the system.

Given a dump.sql file, extract table1 creation and data commands. table2 is the one following table1 in the dump file. You can also use the same idea to extract several consecutive tables.

Retrieves the current WAN ipv4 address via checkip.dyn.com.

Use meaningful exit codes

change "source" to "cat" to view output instead of assigning

sed '$ d' foo.txt.tmp

...deletes last line from the file

This probably only works without modifications in RHEL/CentOS/Fedora.

This is flatcaps tweaked command to make it work on SLES 11.2

Show the crontabs of all the users.