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Only read selected columns
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Say the data are in file data.txt, you can use the colClasses argument of read.table() to skip columns. Here the data in the first 7 columns are "integer" and we set the remaining 6 columns to "NULL" indicating they should be skipped
> read.table("dat...
How to read a text file into a string variable and strip newlines?
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You could use:
with open('data.txt', 'r') as file:
data = file.read().replace('\n', '')
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Create or write/append in text file
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Try something like this:
$txt = "user id date";
$myfile = file_put_contents('logs.txt', $txt.PHP_EOL , FILE_APPEND | LOCK_EX);
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Windows equivalent of the 'tail' command
...utputting the file after the nth line:
DOS Prompt:
C:\>more +2 myfile.txt
The above command will output everything after the first 2 lines.
This is actually the inverse of Unix head:
Unix console:
root@server:~$ head -2 myfile.txt
The above command will print only the first 2 lines of the...
scp or sftp copy multiple files with single command
...ectory/\{a,b,c\} ./
Copy multiple files from local to remote:
$ scp foo.txt bar.txt your_username@remotehost.edu:~
$ scp {foo,bar}.txt your_username@remotehost.edu:~
$ scp *.txt your_username@remotehost.edu:~
Copy multiple files from remote to remote:
$ scp your_username@remote1.edu:/some/remo...
unix - head AND tail of file
Say you have a txt file, what is the command to view the top 10 lines and bottom 10 lines of file simultaneously?
20 Answer...
What is a patch in git version control?
...iff tells us. Let's say I have two versions of this file, one called file1.txt and another one file2.txt, then I run diff and get this:
$ diff -u file1.txt file2.txt
--- file1.txt 2011-11-26 11:07:03.131010360 -0500
+++ file2.txt 2011-11-26 11:07:13.171010362 -0500
@@ -1,2 +1,2 @@
-This is lin...
How to check if a Unix .tar.gz file is a valid file without uncompressing?
...s hello*
ls: hello*: No such file or directory
$ echo "hello1" > hello1.txt
$ echo "hello2" > hello2.txt
$ tar -cvzf hello.tgz hello[12].txt
hello1.txt
hello2.txt
$ rm hello[12].txt
$ ls hello*
hello.tgz
$ tar -xvzf hello.tgz -O
hello1.txt
hello1
hello2.txt
hello2
$ ls hello*
hello.tgz
$ tar -...
String slugification in Python
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pip install python-slugify
Works like this:
from slugify import slugify
txt = "This is a test ---"
r = slugify(txt)
self.assertEquals(r, "this-is-a-test")
txt = "This -- is a ## test ---"
r = slugify(txt)
self.assertEquals(r, "this-is-a-test")
txt = 'C\'est déjà l\'été.'
r = slugify(txt)
se...
Checkout another branch when there are uncommitted changes on the current branch
...ner cases above. We have commits X and Y that both have file path/to/name.txt, and we have an index entry for path/to/name.txt. Maybe all three hashes match. Maybe two of them match and one doesn't. Maybe all three are different. And, we might also have another/file.txt that's only in X or only...