EXAMPLES.md

Examples

Detecting patterns in output

Detect patterns in the output of a command and take action when a pattern is detected.

Restarting jobs

Restart a job when a certain condition is met.

Create a faulty command

Create a command count that faults (prints "error" to stderr) occasionally (when it counts to 5):

sh (Linux)

tend create --overwrite "count" -- sh -c 'for i in $(seq 1 10); do if [ $i -eq 5 ]; then echo "error" >&2; else echo "hello $i"; fi; sleep 1; done'

cmd (Windows)

tend create --overwrite "count" -- cmd /C "@echo off & for /L %i in (1,1,10) do ((if %i==5 (echo error >&2) else (echo hello %i)) & timeout /t 1 /nobreak >nul)"

Detect errors

Create a hook with name error-hook that detects the substring error in the stderr output of the command count-err and restarts the command when the substring is detected:

tend edit "count" hook create "error-hook" detect-substring --stream stderr "error" restart

Stopping jobs

Stop a job when a certain condition is met.

Create a command

tend create --overwrite ping-1111 1.1.1.1

Detect first response and stop the job

Create a hook with name stop-hook that detects the substring from 1.1.1.1 in the stdout output of the command ping and stops the command when the substring is detected:

tend edit "ping-1111" hook create "stop-hook" detect-substring --stream stdout "from 1.1.1.1" stop