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how to use sed, awk, or gawk to print only what is matched?
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My sed (Mac OS X) didn't work with +. I tried * instead and I added p tag for printing match:
sed -n 's/^.*abc\([0-9]*\)xyz.*$/\1/p' example.txt
For matching at least one numeric character without +, I would use:
sed -n '...
Git, rewrite previous commit usernames and emails
... email and committer full name on the computer I'm currently using to make my commits and therefore the users avatar and email address are not there.
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How to concatenate two MP4 files using FFmpeg?
...les used by general users do not support file level concatenation).
$ cat mylist.txt
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'
$ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4
For Windows:
(echo file 'first file.mp4' & echo file 'second file.mp4' )>list...
Git ignore file for Xcode projects
...feature of Xcode - don't exclude them :)
#
# Workspace layout is quite spammy. For reference:
#
# /(root)/
# /(project-name).xcodeproj/
# project.pbxproj
# /project.xcworkspace/
# contents.xcworkspacedata
# /xcuserdata/
# /(your name)/xcuserdatad/
# UserInterf...
Detect if Android device has Internet connection
I need to tell if my device has Internet connection or not. I found many answers like:
15 Answers
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No serializer found for class org.hibernate.proxy.pojo.javassist.Javassist?
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You are my hero.
– Lay Leangsros
Jan 30 '19 at 10:16
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What's the best way to send a signal to all members of a process group?
...an offer an easier way to find the process group ID. For example, to kill my-script.sh's process group, run kill -TERM -$(pgrep -o my-script.sh).
– Josh Kelley
Aug 25 '11 at 13:04
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Why does Internet Explorer not send HTTP post body on Ajax call after failure?
...ere does not seem to be a clear answer to this question, so I will provide my empirical data as a substitute and provide some ways to work around it. Maybe some MS insider will one day shed some light on this...
If HTTP Keep-Alive is disabled on the server, this issue goes away. In other words, yo...
Skip callbacks on Factory Girl and Rspec
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I like this better too. I don't want my factory to permanently behave differently. I want to skip it for a particular set of tests.
– theUtherSide
Oct 4 '17 at 18:54
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When should I use “this” in a class?
... referenced (sans the need for disambiguation), but that is a rare case in my opinion.
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