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

Java - redirect standard output stream to file

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 We can redirect all System.out.println output to a file with below code snippet.

 System.setOut(new PrintStream(new BufferedOutputStream(new FileOutputStream("/tmp/output.txt"))));

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.

Change proxy settings only for Chrome

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Disable proxy setting
Add command line parameter --no-proxy-server= to the command. (In windows, add this to the target path in the shortcut properties)

Specify different proxy
Add command line parameter --proxy-server="127.0.0.1:8080" to the command

Specify no proxy server list
Add command line parameter like this --proxy-bypass-list="127.0.0.1;localhost"