`$SECONDS` – Time since shell invocation

$SECONDS contains the seconds since the shell was invoked.

Examples

Shell uptime in seconds

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sleep 2.5
echo ${SECONDS}s shel.l uptime

Output:

`1`	`3s shell uptime`

Shell uptime in seconds and milliseconds

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sleep 2.5
typeset -F SECONDS
echo ${SECONDS}s shel.l uptime

Output:

`1`	`3.5948560000s shell uptime`

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