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How to ignore xargs commands if stdin input is empty?
...t, put that e.g. in $HOME/bin and add it to the PATH:
#!/bin/bash
stdin=$(cat <&0)
if [[ $1 == "-r" ]] || [[ $1 == "--no-run-if-empty" ]]
then
# shift the arguments to get rid of the "-r" that is not valid on OSX
shift
# wc -l return some whitespaces, let's get rid of them with t...
PowerShell: Setting an environment variable for a single command only
...OO=foo BAR=bar your command here
# To use it with dot-env files
env.exe $(cat .env | grep.exe -v '^#') SOME_OTHER_ENV=val your command
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Check to see if python script is running
...le shell script to check it for you using the return code from ps.
ps up `cat /tmp/mydaemon.pid ` >/dev/null && echo "Running" || echo "Not running"
For extra credit, you can use the atexit module to ensure that your program cleans up its pidfile under any circumstances (when killed, e...
Is std::vector copying the objects with a push_back?
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@tuple_cat your comment should say "if the argument is an rvalue". (If the argument is the name of an entity declared as rvalue reference, then the argument is actually an lvalue and will not be moved from) - check my edit to the a...
MySQL Error 1093 - Can't specify target table for update in FROM clause
I have a table story_category in my database with corrupt entries. The next query returns the corrupt entries:
16 Answers...
Concatenate a vector of strings/character
If I have a vector of type character, how can I concatenate the values into string? Here's how I would do it with paste() :
...
Download File Using Javascript/jQuery
...he server to set the file's MIME Type to a nonsensical value, such as application/x-please-download-me or alternatively application/octet-stream, which is used for arbitrary binary data.
If you only want to open it in a new tab, the only way to do this is for the user to a click on a link with its ...
How do I import .sql files into SQLite 3?
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From a sqlite prompt:
sqlite> .read db.sql
Or:
cat db.sql | sqlite3 database.db
Also, your SQL is invalid - you need ; on the end of your statements:
create table server(name varchar(50),ipaddress varchar(15),id init);
create table client(name varchar(50),ipaddress var...
Ansible: Set variable to file content
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Note that lookup runs locally, while the cat command in @TesterJeff's example is running on the remote machine.
– Alex Dupuy
Jun 5 '14 at 22:13
8
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Writing a dict to txt file and reading it back?
...gt; json.dump(d, open("text.txt",'w'))
This code dumps to a text file
$ cat text.txt
{"two": 2, "one": 1}
Also you can load from a JSON file:
>>> d2 = json.load(open("text.txt"))
>>> print d2
{u'two': 2, u'one': 1}
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