Pv

Pv (Pipe Viewer)

Show progress, throughput, and ETA for data moving through a pipe (brew install pv).

# Progress bar while compressing
pv junkfile.txt | gzip > junkfile.txt.gz
 
# Make a test file to try it on
dd if=/dev/urandom of=junkfile.txt bs=1m count=1024
 
# Throttle a pipe to 1 MB/s
pv -L 1m bigfile | nc host 9000
 
# Progress for a disk image write (give pv the size so it can show %)
pv -s 4g image.iso | dd of=/dev/disk2 bs=4m