Use numfmt command-line utility which is a part of the standard GNU Core Utilities to pretty print decimal or binary numbers.
Pretty print binary number.
$ echo 2K | numfmt --from=iec 2048
Pretty print decimal number.
$ echo 2K | numfmt --from=si 2000
Pretty print binary number using bytes and GiB.
$ numfmt --from=iec 1G 1073741824
$ numfmt --from=iec --to=iec 1073741824 1.0G
Pretty print number of open files.
$ lsof | wc -l 207759
$ lsof | wc -l | numfmt --to=si 207K
Pretty print memory usage of specific process.
$ sudo pmap 7365 | tail -1 total 226396K
$ sudo pmap 7365 | tail -1 | numfmt --from=iec --field=2 --to=iec total 222M
Pretty print file sizes using defined padding.
$ du --summarize --apparent-size --human * 3,0K haproxy.cfg 1,1G disk.vdi 384 stats-config.lua 21K stats.lua 6,3K stats.sh
$ du --summarize --apparent-size --bytes * | numfmt --to=iec --padding=-7 3,0K haproxy.cfg 1,1G disk.vdi 384 stats-config.lua 21K stats.lua 6,3K stats.sh
Pretty print available disk space by replacing specific fields.
$ df -h Filesystem Type Size Used Avail Use% Mounted on tank/lxd/containers/development zfs 791G 1.2G 790G 1% / none tmpfs 492K 0 492K 0% /dev udev devtmpfs 16G 0 16G 0% /dev/fuse tmpfs tmpfs 100K 0 100K 0% /dev/lxd tmpfs tmpfs 100K 0 100K 0% /dev/.lxd-mounts tmpfs tmpfs 16G 0 16G 0% /dev/shm tmpfs tmpfs 16G 132K 16G 1% /run tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs tmpfs 16G 0 16G 0% /sys/fs/cgroup tmpfs tmpfs 3.2G 0 3.2G 0% /run/user/1983
$ df -BK Filesystem Type 1K-blocks Used Available Use% Mounted on tank/lxd/containers/development zfs 829321984K 1212416K 828109568K 1% / none tmpfs 492K 0K 492K 0% /dev udev devtmpfs 16439564K 0K 16439564K 0% /dev/fuse tmpfs tmpfs 100K 0K 100K 0% /dev/lxd tmpfs tmpfs 100K 0K 100K 0% /dev/.lxd-mounts tmpfs tmpfs 16456228K 0K 16456228K 0% /dev/shm tmpfs tmpfs 16456228K 132K 16456096K 1% /run tmpfs tmpfs 5120K 0K 5120K 0% /run/lock tmpfs tmpfs 16456228K 0K 16456228K 0% /sys/fs/cgroup tmpfs tmpfs 3291244K 0K 3291244K 0% /run/user/1983
$ df -BK | numfmt --header --from=iec --field 3-5 --header=1 --to=iec Filesystem Type 1K-blocks Used Available Use% Mounted on tank/lxd/containers/development zfs 791G 1.2G 790G 1% / none tmpfs 492K 0 492K 0% /dev udev devtmpfs 16G 0 16G 0% /dev/fuse tmpfs tmpfs 100K 0 100K 0% /dev/lxd tmpfs tmpfs 100K 0 100K 0% /dev/.lxd-mounts tmpfs tmpfs 16G 0 16G 0% /dev/shm tmpfs tmpfs 16G 132K 16G 1% /run tmpfs tmpfs 5.0M 0 5.0M 0% /run/lock tmpfs tmpfs 16G 0 16G 0% /sys/fs/cgroup tmpfs tmpfs 3.2G 0 3.2G 0% /run/user/1983
Print number of blocks using specified block size.
$ numfmt --from=iec --to=iec --to-unit=4096 8192M 2.0M
$ numfmt --from=iec --to=iec --from-unit=4Ki --format="%.2f" 12 48.00K
$ numfmt --from=iec --to=iec --from-unit=512 --format="%.2f" 3 1.50K
Print real disk capacity for 256G hard disk.
$ numfmt --from=si --to=iec --format="%.1f" 256G 238.5G
Print real disk capacity for 1T hard disk.
$ numfmt --from=si --to=iec --format="%.1f" 1T 931.4G