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Git: Remove committed file after push
...you can check on which commits the file was changed.
git log path/to/file.txt
Then you can checkout the file with the revision number.
git checkout 3cdc61015724f9965575ba954c8cd4232c8b42e4 /path/to/file.txt
After that you can commit and push it again.
...
Hashing a file in Python
...y_essentials import hashing as hs
hash = hs.fileChecksum("path/to/the/file.txt", "sha256")
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What is the purpose of class methods?
...ource,dest):pass
def moveDir(source,dest):pass
//usage
FileUtil.copy("1.txt","2.txt")
FileUtil.moveDir("dir1","dir2")
This way is more flexible and more maintainable, you group functions together and its more obvious to what each function do. Also you prevent name conflicts, for example the fun...
How to export data as CSV format from SQL Server using sqlcmd?
...
sqlcmd -S myServer -d myDB -E -o "MyData.txt" ^
-Q "select bar from foo" ^
-W -w 999 -s","
The last line contains CSV-specific options.
-W remove trailing spaces from each individual field
-s"," sets the column seperator to the comma (,)
-w 999 ...
Batch file to delete files older than N days
...* /d:%1 /L /I null') do if exist %%~nxa echo %%~nxa >> FILES_TO_KEEP.TXT
for /f "tokens=*" %%a IN ('xcopy *.* /L /I /EXCLUDE:FILES_TO_KEEP.TXT null') do if exist "%%~nxa" del "%%~nxa"
This deletes files older than a given date. I'm sure it can be modified to go back seven days from the curre...
Bash script to set up a temporary SSH tunnel
...
$ sudo bash; exit
or sometimes:
$ : > sensitive-temporary-data.txt; bash; rm -f sensitive-temporary-data.txt; exit
These commands create a nested shell where I can do all my work; when I'm finished I hit CTRL-D and the parent shell cleans up and exits as well. You could easily throw ba...
How to create a new java.io.File in memory?
...Path("/foo");
Files.createDirectory(foo);
Path hello = foo.resolve("hello.txt"); // /foo/hello.txt
Files.write(hello, ImmutableList.of("hello world"), StandardCharsets.UTF_8);
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Do I need to manually close an ifstream?
... <fstream>
using std::ofstream;
int main() {
ofstream ofs("hello.txt");
ofs << "Hello world\n";
return 0;
}
writes file contents. But:
#include <stdlib.h>
#include <fstream>
using std::ofstream;
int main() {
ofstream ofs("hello.txt");
ofs << "Hello wor...
How do I make a redirect in PHP?
...
<?php
header('Location: static.html');
$fh = fopen('/tmp/track.txt', 'a');
fwrite($fh, $_SERVER['REMOTE_ADDR'] . ' ' . date('c') . "\n");
fclose($fh);
?>
Result of three executions:
bart@hal9k:~> cat /tmp/track.txt
127.0.0.1 2009-04-21T09:50:02+02:00
127.0.0.1 2009-04-21...
redirect COPY of stdout to log file from within bash script itself
...) into a named pipe ( >() ) running "tee"
exec > >(tee -i logfile.txt)
# Without this, only stdout would be captured - i.e. your
# log file would not contain any error messages.
# SEE (and upvote) the answer by Adam Spiers, which keeps STDERR
# as a separate stream - I did not want to stea...