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Unix command to prepend text to a file
Is there a Unix command to prepend some string data to a text file?
16 Answers
16
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Vagrant error : Failed to mount folders in Linux guest
...: Attempting graceful shutdown of VM...
...
==> default: Machine booted and ready!
GuestAdditions 4.3.12 running --- OK.
==> default: Checking for guest additions in VM...
==> default: Configuring and enabling network interfaces...
==> default: Exporting NFS shared folders...
==> defa...
How to trick an application into thinking its stdout is a terminal, not a pipe
...
Aha!
The script command does what we want...
script --return --quiet -c "[executable string]" /dev/null
Does the trick!
Usage:
script [options] [file]
Make a typescript of a terminal session.
Options:
-a, --append append...
Reloading submodules in IPython
Currently I am working on a python project that contains sub modules and uses numpy/scipy. Ipython is used as interactive console. Unfortunately I am not very happy with workflow that I am using right now, I would appreciate some advice.
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How to hide the “back” button in UINavigationController?
...er use this:
[self.navigationItem setHidesBackButton:YES animated:YES];
And to restore it:
[self.navigationItem setHidesBackButton:NO animated:YES];
--
[UPDATE]
Swift 3.0:
self.navigationItem.setHidesBackButton(true, animated:true)
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NSPredicate: filtering objects by day of NSDate property
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Given a NSDate * startDate and endDate and a NSManagedObjectContext * moc:
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"(date >= %@) AND (date <= %@)", startDate, endDate];
NSFetchRequest *request = [[[NSFetchRequest alloc] init] ...
COALESCE Function in TSQL
...at. ISNULL takes only two parameters, the field being evaluated for NULL, and the result you want if it is evaluated as NULL. COALESCE will take any number of parameters, and return the first value encountered that isn't NULL.
There's a much more thorough description of the details here
http://...
import .css file into .less file
...ing an option, e.g.:
@import (css) "lib";
will output
@import "lib";
and
@import (less) "lib.css";
will import the lib.css file and treat it as less. If you specify a file is less and do not include an extension, none will be added.
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How to get number of entries in a Lua table?
...ind an answer. The Lua # operator only counts entries with integer keys, and so does table.getn :
8 Answers
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iOS: How to store username/password within an app?
I have a login-screen in my iOS app.
The username and password will be saved in the NSUserDefaults and be loaded into the login-screen again when you enter the app again (of course, NSUserDefaults are permanent).
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