github.com/apptainer/singularity@v3.1.1+incompatible/examples/instances/Singularity (about)

     1  BootStrap: busybox
     2  MirrorURL: https://www.busybox.net/downloads/binaries/1.26.1-defconfig-multiarch/busybox-x86_64
     3  
     4  %startscript
     5      exec nc -ll -p $1 -e /bin/cat 2>/dev/null