Change date in Mac via terminal

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sudo date MMDDHHmmYY

(Month,date,hour,minute,year)

For e.g.,  sudo date 0101101019 to change date to 10 hour 10 min of 2019 Jan 01.

Validate firewall connectivity using nc

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In absence of telnet we can use nc (which version??) to validate connectivity.

nc -w 2 -v 10.0.0.1 < /dev/null; exitCode=$?; echo "Exit code = $exitCode"; if [ $exitCode -ge 1 ]; then echo "No connectivity"; else echo 'SUCCESS!!!'; fi; >> fw_validation.txt

Bash for loop examples

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For loop example in bash script:
To get yarn log files for multiple spark jobs, we can use this command.
for i in `cat appid.txt`; do echo $i; yarn logs -applicationId $i > sparkjob_01sep_logs/$i.log; echo "——"; done




For loop with sequence and ssh into multiple servers:
To login into multiple servers and run a command, we can use below command.

for i in `seq 101 125`;do ssh -q machinename$i "hostname;ls -ltr";done

Create a desktop shortcut in Mac with Automator

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Open Automator
File > New
select Application
Then add "Run Shell Script" option
Give the command to run, here I am giving Google chrome canary with no proxy option

/Applications/Google\ Chrome\ Canary.app/Contents/MacOS/Google\ Chrome\ Canary --no-proxy-server=

Then Save with the name you want.







By default this will show automator icon.
Here is how to set your favorite icon.
Right click on Chrome canary icon and select "Get Info"



Then click on the icon and press Cmd+c
to copy the icon.
Now open info window on newly created icon, select the icon in the same place (which shows automator icon) press Cmd+v to paste the previously copied icon.