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Opposite of %in%: exclude rows with values specified in a vector
A categorical variable V1 in a data frame D1 can have values represented by the letters from A to Z. I want to create a subset D2, which excludes some values, say, B, N and T. Basically, I want a command which is the opposite of %in%
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Where are the PostgreSQL logs on macOS?
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Just ask your database:
SELECT
*
FROM
pg_settings
WHERE
category IN( 'Reporting and Logging / Where to Log' , 'File Locations')
ORDER BY
category,
name;
In my case, it's in "/Library/PostgreSQL/8.4/data/pg_log"
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using awk with column value conditions
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please try this
echo $VAR | grep ClNonZ | awk '{print $3}';
or
echo cat filename | grep ClNonZ | awk '{print $3}';
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Python base64 data decode
...nted out an even simpler solution: base64 -d
So you can use it like this:
cat "FILE WITH STRING" | base64 -d > OUTPUTFILE
#Or You Can Do This
echo "STRING" | base64 -d > OUTPUTFILE
That will save the decoded string to outputfile and then attempt to identify file-type using either the file t...
Is there a command to list all Unix group names? [closed]
... If numbered lines are desirable, do getent group | cut -d: -f1 | sort | cat -n.
– MLC
Sep 22 '16 at 20:28
1
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Git for beginners: The definitive practical guide
...ariable $GIT_DIR set in your current shell, git will ignore your current location and use the repository at $GIT_DIR. I should know, I lost an hour to that yesterday.
– sanmiguel
Mar 1 '12 at 12:17
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Get the current time in C
... parameter works to return the current time.
– Super Cat
Dec 21 '15 at 0:30
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(grep) Regex to match non-ASCII characters?
...e control bytes so strings can be the better option sometimes. For example cat test.torrent | perl -pe 's/[^[:ascii:]]+/\n/g' will do odd things to your terminal, where as strings test.torrent will behave.
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How does a public key verify a signature?
...d message_enc_pub.ssl # Print the binary contents of the encrypted message
cat message_pub.txt # Print the decrypted message
echo "done\n"
# Encrypt with private & decrypt with public
echo "Private key encrypts and public key decrypts"
echo "--------------------------------------------"
openssl...
PHP substring extraction. Get the string before the first '/' or the whole string
...strtok function:
strtok($mystring, '/')
For example:
$mystring = 'home/cat1/subcat2/';
$first = strtok($mystring, '/');
echo $first; // home
and
$mystring = 'home';
$first = strtok($mystring, '/');
echo $first; // home
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