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Every new command is wrapped in a tweet and posted to Twitter. Following the stream is a great way of staying abreast of the latest commands. For the more discerning, there are Twitter accounts for commands that get a minimum of 3 and 10 votes - that way only the great commands get tweeted.
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Interesting to see which packages are larger than the kernel package.
Useful to understand which RPMs might be candidates to remove if drive space is restricted.
"nl -ba" numbers all lines in the file (including empty lines), "sort -nr"
sorts the lines in descending order, and the "cut" command finally removes
the line numbers again.
usage: dng BRE [selection]
default selection is the last match
DNS is ok, but although domainnames may be easier to remember than IP numbers, it still requires typing them out. This can be error-prone. Even more so than typing IPv4 numbers, depending on the domainname, its length and complexity.
Add permanent line numbers to a file without creating a temp file.
The rm command deletes file10 while the nl command works on the open file descriptor of file10 which it outputs into a new file again named file10.
The new file10 will now be numbered in the same directory with the same file name and content as before, but it will in fact be a new file, using (ls -i) to show its inode number will prove this.
This function is used to sort selected lines of a text file to the end of that file. Especially useful in cases where human intervention is necessary to sort out parts of a file. Let's say that you have a text file which contains the words
For whatever reason, you want to sort all words rhyming with 'tough' to the bottom of the file, and all words denoting colors to the top, while keeping the order of the rest of the file intact.
'$EDITOR' will open, showing all of the lines in the given file, numbered with '0' padding. Adding a '~' to the beginning of the line will cause the line to sort to the end of the file, adding '!' will cause it to sort to the beginning.
Works in RHEL5 and derivatives.
Not as far off as you thought, now is it?
Next time you see a mac fanboy bragging about 64-bitness of 10.6 give him this so he might sh?
The nl command lists the contents of a file where is each line is prefixed by a line number. For more information about this command, check out its man page. I tested under Mac OS X and Xubuntu 9.04
Low on disk space? Check the largest installed RPMs for delete canditates.