Check command success in bash I'm currently writing a small script to backup bulks of floppy disks and format them afterward for later use. I use `dd` to copy the disk's image and `cp` to copy all the files on the disk. Here are the commands I use to do so: # Copying disk image dd if="/dev/fd0" of="/path/to/backup/folder" &>/dev/null && sync # Copying disk files cp -R "/mnt/floppy/." "/path/to/backup/folder/" &>/dev/null After this process, the script needs to format the floppy disk. My problem is that I want my script to format the floppy disk only if both backup commands (`dd` and `cp`) were successful. For example, if `dd` couldn't copy all 1.44MB of the floppy disk because of bad blocks, then do not format the floppy disk. How can I test if both commands were successful (They must be tested seperatly, as I do not always backup both disk's image and files)?

I'd do:


ok=true
if dd ...; then
sync
else
ok=false
fi

cp ... || ok=false

if "$ok"; then
mformat...
fi