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Looping through a hash, or using an array in PowerShell
...ifferent than the foreach statement here. ForEach-Object makes use of the pipeline, which can be much faster if you're already working with a pipeline. The foreach statement does not; it's a simple loop.
– JamesQMurphy
Jan 3 '15 at 3:12
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How can I view a git log of just one user's commits?
When using git log , how can I filter by user so that I see only commits from that user?
15 Answers
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How to exclude certain messages by TAG name using Android adb logcat?
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If you are using adb logcat you could pipe it through grep and use it's inverted matching:
From the grep manpage:
v, --invert-match
Invert the sense of matching, to select non-matching lines.
For example:
$adb logcat | grep --invert-match 'notsh...
Java 理论与实践: 线程池与工作队列 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...占用，这些任务依次等待排队任务的结果，而这些任务又无法执行，因为所有的线程都很忙。
在为时间可能很长的操作使用合用的线程时要小心。如果程序必须等待诸如 I/O 完成这样的某个资源，那么请指定最长的等待时间，...
Merge / convert multiple PDF files into one PDF
...putFile=output.pdf file1.pdf file2.pdf file3.pdf ...
This in turn can be piped directly into pdf2ps.
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Aborting a shell script if any command returns a non-zero value?
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Bear in mind that set -e sometimes is not enough, specially if you have pipes.
For example, suppose you have this script
#!/bin/bash
set -e
./configure > configure.log
make
... which works as expected: an error in configure aborts the execution.
Tomorrow you make a seemingly trivial ch...
What's the difference between a file descriptor and file pointer?
...tc.
File descriptor API is low-level, so it allows to work with sockets, pipes, memory-mapped files (and regular files, of course).
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Extract substring in Bash
... The problem is that the input is dynamic since I also use the pipe to get it so it's basically. git log --oneline | head -1 | cut -c 9-(end -1)
– Niklas
Jul 31 '15 at 18:19
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Profiling Vim startup time
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You could run vim -V, pipe the output through a utility that adds timestamps and analyze the output. This command lines does this, e.g.:
vim -V 2>&1 | perl -MTime::HiRes=time -ne 'print time, ": ", $_' | tee vilog
You might have to blind...
How could the UNIX sort command sort a very large file?
...command line
if [ $# != 2 ]
then
usage
exit
fi
pv $1 | parallel --pipe --files sort -S512M | parallel -Xj1 sort -S1024M -m {} ';' rm {} > $2
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