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How to use sed to replace only the first occurrence in a file?
...oo' replaced
Unrelated
2nd foo
3rd foo
A POSIX-features-only sed such as BSD (macOS) sed (will also work with GNU sed):
Since 0,/re/ cannot be used and the form 1,/re/ will not detect re if it happens to occur on the very first line (see above), special handling for the 1st line is required.
Mikha...
Check if a string is a date value
... Another reason to be careful - numbers parse as dates. Date.parse("4.3") is 986270400000.
– Mogsdad
Feb 21 '13 at 6:05
2
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Is null an Object?
...tored in variables [...]: primitive values (§4.2) and reference values (§4.3)." It's the null reference that can be assigned via the null literal. ...cont'd...
– Gerold Broser
Aug 15 '17 at 0:29
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dd: How to calculate optimal blocksize? [closed]
...d. Several Unix-like systems (including Linux and at least some flavors of BSD) define the st_blksize member in the struct stat that gives what the kernel thinks is the optimal block size:
#include <sys/stat.h>
#include <stdio.h>
int main(void)
{
struct stat stats;
if (!stat("...
Mipmap drawables for icons
Since Android 4.3 (Jelly Bean) we can now make use of the res/mipmap folders to store "mipmap" images.
11 Answers
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内存管理内幕：动态分配的选择、折衷和实现 - C/C++ - 清泛网 - 专注C/C++及内核技术
...资料部分中，有一篇描述 Doug Lea 的 Malloc 实现的文章。
BSD Malloc：BSD Malloc 是随 4.2 BSD 发行的实现，包含在 FreeBSD 之中，这个分配程序可以从预先确实大小的对象构成的池中分配对象。它有一些用于对象大小的 size 类，这些对象...
The difference between fork(), vfork(), exec() and clone()
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Note that the BSD and POSIX requirements for vfork are so weak that it would be legal to make vfork a synonym of fork (and POSIX.1-2008 removes vfork from the spec entirely). If you happen to test your code on a system that synonymizes the...
Make git automatically remove trailing whitespace before committing
... substituted with cut -f1 -d:. This should work the same on both Linux and BSD based platforms.
– Ihor Kaharlichenko
Apr 11 '11 at 9:03
2
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Why do I get access denied to data folder when using adb?
...g permission thing forever. I had a problem about su: not found on Android 4.3 but since i upgraded to 4.4.2 problem disappeared. 4.3 seems to have problems.
– user1299518
Nov 6 '14 at 1:21
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Timeout a command in bash without unnecessary delay
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You can do this entirely with bash 4.3 and above:
_timeout() { ( set +b; sleep "$1" & "${@:2}" & wait -n; r=$?; kill -9 `jobs -p`; exit $r; ) }
Example: _timeout 5 longrunning_command args
Example: { _timeout 5 producer || echo KABOOM $?; } | consu...