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Useless use of cat?
...on I mentioned. That reason has to do with the orthogonal design spirit of Unix. grep does not cut and ls does not grep. Therefore at the very least grep foo file1 file2 file3 goes against the design spirit. The orthogonal way of doing it is cat file1 file2 file3 | grep foo. Now, grep foo file1 is m...
How can I see the assembly code for a C++ program?
...gram yourself, you can ask your compiler to emit assembly source. For most UNIX compilers use the -S switch.
If you are using the GNU assembler, compiling with -g -Wa,-alh will give intermixed source and assembly on stdout (-Wa asks compiler driver to pass options to assembler, -al turns on assemb...
Is there a way for multiple processes to share a listening socket?
...s without using fork() and doesn't have a parent/child relationship, using Unix Sockets.
– Rahly
Aug 9 '14 at 21:28
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Find CRLF in Notepad++
...on't work.
You can manually copy the EOL and paste it into the field for Unix files (LF-only).
Simple search (Ctrl+F), Search Mode = Extended
The "Extended" option shows \n and \r as characters that could be matched.
As with the Normal search mode, Notepad++ is looking for the exact...
How do I change read/write mode for a file using Emacs?
...ent buffer writable.
Make the buffer writable as well."
(interactive)
(unix-output "chmod" "+w" (buffer-file-name))
(toggle-read-only nil)
(message (trim-right '(?\n) (unix-output "ls" "-l" (buffer-file-name)))))
The function depends on unix-output and trim-right:
(defun unix-output (comm...
How to get file creation & modification date/times in Python?
...platform way is easy - just call os.path.getmtime(path) and you'll get the Unix timestamp of when the file at path was last modified.
Getting file creation dates, on the other hand, is fiddly and platform-dependent, differing even between the three big OSes:
On Windows, a file's ctime (documented...
Difference between two dates in MySQL
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select
unix_timestamp('2007-12-30 00:00:00') -
unix_timestamp('2007-11-30 00:00:00');
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How do I daemonize an arbitrary script in unix?
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You can daemonize any executable in Unix by using nohup and the & operator:
nohup yourScript.sh script args&
The nohup command allows you to shut down your shell session without it killing your script, while the & places your script in the backgr...
get UTC time in PHP
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@sanmai: a Unix timestamp is by definition always UTC. en.wikipedia.org/wiki/Unix_time
– nikc.org
Jul 20 '15 at 8:20
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Why do people write the #!/usr/bin/env python shebang on the first line of a Python script?
...rdcode something like #!/usr/bin/python; that's ok, but less flexible.
In Unix, an executable file that's meant to be interpreted can indicate what interpreter to use by having a #! at the start of the first line, followed by the interpreter (and any flags it may need).
If you're talking about oth...