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linux-cli.md

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Set NOPASSWD for sudo user

echo "$USER ALL=(ALL) NOPASSWD:ALL" | sudo EDITOR="tee -a" visudo

Disable IPv6 Ubuntu

sudo sed -i '$a\net.ipv6.conf.all.disable_ipv6=1 \
net.ipv6.conf.default.disable_ipv6=1 \
net.ipv6.conf.lo.disable_ipv6=1' /etc/sysctl.conf \
&& sudo sysctl -p

Add Column with value to file

awk 'BEGIN{ FS = OFS = "|" } { print $0, (NR==1? "COLUMNNAME" : "ROWVALUE") }' <SOURCEFILENAME> > tmp && mv tmp <SOURCEFILENAME>

Remove characters from specific column with defined output seperator

awk -F'|' 'BEGIN { OFS = "|"}{ gsub(/\abcd/,"", $5); print } ' <SOURCEFILE> > <TARGETFILE>

View memory usage of an application or process

ps -eo size,pid,user,command --sort -size | awk '{ sz=$1/1024 ; printf("%13.2f MB ",sz) } { for ( x=4 ; x<=NF ; x++ ) { printf("%s ",$x) } print "" }' | cut -d "" -f2 | cut -d "-" -f1 | grep <PROCESSNAME> | awk '{ SUM += $1} END { print SUM }'