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How does the vim “write with sudo” trick work?
...bstitute a shell command to receive the buffer contents. For instance, :w !cat will just display the contents.
If Vim wasn't run with sudo access, its :w can't modify a protected file, but if it passes the buffer contents to the shell, a command in the shell can be run with sudo. In this case, we u...
How can I shuffle the lines of a text file on the Unix command line or in a shell script?
...eir hash value.
[Editor's note: sort -R almost shuffles, except that duplicate lines / sort keys always end up next to each other. In other words: only with unique input lines / keys is it a true shuffle. While it's true that the output order is determined by hash values, the randomness comes from ...
Why can I use a function before it's defined in JavaScript?
...r combo. Consider updating with a link/excerpt to the ES5 annotated specification. (Which is a bit more accessible.)
– user166390
Jul 16 '12 at 17:58
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Why aren't Java Collections remove methods generic?
... pass in to remove(); it only requires that they be equal. From the specification of remove(), remove(o) removes the object e such that (o==null ? e==null : o.equals(e)) is true. Note that there is nothing requiring o and e to be the same type. This follows from the fact that the equals() method tak...
Sending a mail from a linux shell script
...command.
For instance, to send the content of a file, you can do this:
$ cat /path/to/file | mail -s "your subject" your@email.com
man mail for more details.
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Is there a Unix utility to prepend timestamps to stdin?
...ash is. I didn't think there would be such an easy solution for this complicated task.
– recluze
Sep 11 '12 at 10:58
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Returning a boolean from a Bash function
...ted in the function.
Therefore, we don't have to EVER use 0 and 1 to indicate True and False. The fact that they do so is essentially trivial knowledge useful only for debugging code, interview questions, and blowing the minds of newbies.
The bash manual also says
otherwise the function’s r...
How to detect the physical connected state of a network cable/connector?
...mly generates an IP address for it. I get an "Invalid argument" error from catting the carrier
– VocoJax
Sep 12 '18 at 17:13
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How to remove/delete a large file from commit history in Git repository?
... highly useful alias. With the --name-status switch, we can see tree modifications associated with each commit.
In the “Careless” commit (whose SHA1 object name is ce36c98) the file oops.iso is the DVD-rip added by accident and removed in the next commit, cb14efd. Using the technique described ...
What's an easy way to read random line from a file in Unix command line?
...ork on any of my systems (CentOS 5.5, Mac OS 10.7.2). Also, useless use of cat, could be reduced to sort --random-sort < $FILE | head -n 1
– Steve Kehlet
Feb 16 '12 at 19:02
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