What does `${@:3}` mean in `dist_train.sh`? #8906

songyuc · 2022-09-28T10:58:27Z

songyuc
Sep 28, 2022

Hi, guys!
I am learning MMDetection today, and I am curious about the meaning of ${@:3} mean in dist_train.sh, as [code].

Your answer and guide will be appreciated!

Answered by i-aki-y

${@} is a special parameter that contains whole positional parameters ($1, $2, ...)
${@:n} means expand the array from n-th parameter to the end ($n, $n+1, ...)
For more detail, see the "${parameter:offset}" section in:
https://www.gnu.org/software/bash/manual/bash.html#Shell-Parameter-Expansion

i-aki-y · 2022-09-29T08:21:11Z

${@} is a special parameter that contains whole positional parameters ($1, $2, ...)
${@:n} means expand the array from n-th parameter to the end ($n, $n+1, ...)
For more detail, see the "${parameter:offset}" section in:
https://www.gnu.org/software/bash/manual/bash.html#Shell-Parameter-Expansion

1 reply

Thank you so much!