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find -exec with multiple commands
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Never embed {} in shell code. See unix.stackexchange.com/questions/156008/…
– Kusalananda
Sep 3 '17 at 7:03
3
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Regex: Remove lines containing “help”, etc
...neat trick. I'd rather get it done with a few simple clicks than fire up a Unix console (ignoring that I'm mostly on Windows), cd into the path, and type in a complex command (worrying about syntax and about screwing up permanently then realizing there's no backup). [Don't get me wrong, I use consol...
Python's time.clock() vs. time.time() accuracy?
...iously in 2.7, according to the time module docs:
time.clock()
On Unix, return the current processor time as a floating point number
expressed in seconds. The precision, and in fact the very definition
of the meaning of “processor time”, depends on that of the C function
of the sa...
Postgresql: Scripting psql execution with password
...s often available to all users, and therefore insecure. However, in Linux/Unix environments you can provide an environment variable for a single command like this:
PGPASSWORD=yourpass psql ...
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Rearrange columns using cut
...); it's probably a bug that a workaround like $ should be necessary. See: unix join separator char.
join needs two filenames, even though there's just one file being worked on. Using the same name twice tricks join into performing the desired action.
For systems with low resources join offers a sm...
How can I connect to MySQL in Python 3 on Windows?
...protocol.
Example:
import pymysql
conn = pymysql.connect(host='127.0.0.1', unix_socket='/tmp/mysql.sock', user='root', passwd=None, db='mysql')
cur = conn.cursor()
cur.execute("SELECT Host,User FROM user")
for r in cur:
print(r)
cur.close()
conn.close()
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glob exclude pattern
... rules for glob are not regular expressions. Instead, they follow standard Unix path expansion rules. There are only a few special characters: two different wild-cards, and character ranges are supported [from glob].
So you can exclude some files with patterns.
For example to exclude manifests fi...
Redirecting stdout to “nothing” in python
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If you're in a Unix environment (Linux included), you can redirect output to /dev/null:
python myprogram.py > /dev/null
And for Windows:
python myprogram.py > nul
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How to determine the Boost version on a system?
...y mentioned in path).
I guess the fastest way to determine version on any UNIX-like system will be to search for boost in /usr:
find /usr -name "boost"
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Getting the last argument passed to a shell script
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@mcoolive: it even works in the unix v7 bourne shell from 1979. you can't get more portable if it runs on both v7 sh and POSIX sh :)
– Dominik R
Nov 22 '19 at 10:41
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