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Pipe output and capture exit status in Bash
...d in your last foreground pipeline of commands.
<command> | tee out.txt ; test ${PIPESTATUS[0]} -eq 0
Or another alternative which also works with other shells (like zsh) would be to enable pipefail:
set -o pipefail
...
The first option does not work with zsh due to a little bit differen...
What is the difference between 'java', 'javaw', and 'javaws'?
...ion works with javaw:
javaw -cp ... mypath.MyClass ... arguments 1>log.txt 2>err.txt
It means, if the Java application prints out anything via System.out or System.err, it is written to those files, as also with using java (without w). Especially on starting java, the JRE may write starting...
How can I read command line parameters from an R script?
...te(length(readLines(file)) * opt$factor))
}
Given an arbitrary file blah.txt with 23 lines.
On the command line:
Rscript script.R -h outputs
Usage: script.R [options] file
Options:
-n, --count_lines
Count the line numbers [default]
-f FACTOR, --factor=FACTOR
...
Catching an exception while using a Python 'with' statement
...
from __future__ import with_statement
try:
with open( "a.txt" ) as f :
print f.readlines()
except EnvironmentError: # parent of IOError, OSError *and* WindowsError where available
print 'oops'
If you want different handling for errors from the open call vs the working...
Creating an empty file in C#
...TF8 encoding (or unicode or something else): <File.WriteAllText("c:\del.txt", String.Empty, System.Text.Encoding.UTF8);>
– Fil
Mar 8 '17 at 14:54
1
...
File system that uses tags rather than folders?
...ra tags can appear as directories inside /etc/init.d. If there is a file a.txt with three tags i.e 'etc', 'init.d' & 'asdf' then 'asdf' will appear as directory inside /etc/init.d and full path of a.txt will become /etc/init.d/asdf/a.txt.
...
How do I change the text of a span element using JavaScript?
...; //INSECURE!!
The right way:
span = document.getElementById("myspan");
txt = document.createTextNode("your cool text");
span.appendChild(txt);
For more information about this vulnerability:
Cross Site Scripting (XSS) - OWASP
Edited nov 4th 2017:
Modified third line of code according to @mumu...
How to get past the login page with Wget?
... the server. This only needs to be done once.
wget --save-cookies cookies.txt \
--keep-session-cookies \
--post-data 'user=foo&password=bar' \
--delete-after \
http://server.com/auth.php
# Now grab the page or pages we care about.
wget --load-cookies cookies.txt \
http...
How can I view an old version of a file with Git?
...date looks like this:
git show HEAD@{2013-02-25}:./fileInCurrentDirectory.txt
Note that HEAD@{2013-02-25} means "where HEAD was on 2013-02-25" in this repository (using the reflog), not "the last commit before 2013-02-25 in this branch in history".
...
Quick way to list all files in Amazon S3 bucket?
... as list.py, open a terminal, and then run:
$ python list.py > results.txt
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