Bash scripting tricks
Bash tricks Check bash version in script if ((BASH_VERSINFO[0] < 4)) then echo “Sorry, you need at least bash-4.0 to run this script.” exit 1 fi Reading columns from a file in bash array table_collection=( $(cut -d $’\t’ -f1...
Category: Mac
Old bash version on MacOS ?
What? An older bash version? Are you seeing and still not believing on something like below, MacBook-Pro:~$ bash –version GNU bash, version 3.2.57(1)-release (x86_64-apple-darwin16) Copyright (C) 2007 Free Software Foundation, Inc. Well that is my MBP as of Mar 29,...
Replace invalid code signature in Mac apps
What? Replacing the invalid code signature in mac apps with a new one How? Example: sudo codesign –force –sign – /Applications/DBeaver.app Symptoms MacOS gives messages like – “Dbeaver” is damaged and can’t be opened. You should move it to the Trash. ...
sudo hangs after macOS upgrade (Sierra 10.12.4 Public Beta x)
Okay, so lately in Jan 2017 I upgraded to macOS Sierra 10.12.4 as I have the bug to stick to latest and the greatest…. and, hell broke loose!! really! No sudo !! Yes, no SUDO! No matter how much I yelled,...
Changing Wine key mappings on Mac OS X
Source: https://palant.de/2014/02/14/crazy-hacks-changing-wine-key-mappings-on-mac-os-x Remap CMD keys on wine (MacOS) One of the biggest quirks of using a Mac is its keyboard — in addition to the usual Control (⌃) and Alt a.k.a. Option (⌥) keys you also have the Command (⌘) key. Unlike...
tee command
Split program output to console and to a file Basic usage $ command | tee out_file.txt Appending to the output file using -a $ command | tee -a out_file.txt Redirecting stderr and stdout $ command |& tee -a out_file.txt Example...
Mac OS tips
Change hostname Change hostname $ sudo scutil –-set HostName <new hostname> Related posts: Super charge bash with these bash_profile tips SSH Auto completion on OSX Can’t connect Excel to Hive using ODBC driver on MAC brew packages and...
AWK Syntax
AWK syntax: awk [-Fs] “program” [file1 file2…] # commands come from DOS cmdline awk ‘program{print “foo”}’ file1 # single quotes around double quotes # NB: Don’t use single quotes alone if the embedded info will contain the # vertical bar...
Chart of similar operations with sed and awk
Chart of similar operations with sed and awk ——————————————– string ====== sed “s/from/to/” awk ‘{sub(“from”,”to”); print}’ sed “s/from/to/g” awk ‘{gsub(“from”,”to”); print}’ sed “s/from/to/3” awk ‘{$0=gensub(“from”,”to”,3); print}’ regex ===== sed “s/reg.*$/_&_/” awk ‘{sub(/reg.*$/, “_&_”); print}’ sed “s/reg[ex]/YY/g” awk ‘{gsub(/reg[ex]/, “YY”); print}’...
awk one liners
HANDY ONE-LINE SCRIPTS FOR AWK 30 April 2008 Compiled by Eric Pement – eric [at] pement.org version 0.27 Latest version of this file (in English) is usually at: http://www.pement.org/awk/awk1line.txt This file will also be available in other languages: Chinese -...
