Move disk space to another partition in linux

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Could anyone please tell me how to allocate more space to one partition from another partition?

The disk structure I have is as follows:

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_a
                       50G   43G  4.4G  91% /
tmpfs                  24G  9.6G   14G  41% /dev/shm
/dev/sda1             485M   86M  374M  19% /boot
/dev/mapper/vg_b
                      157G   77G   72G  52% /home
tmpfs                  20G     0   20G   0% /var/lib/zx/logs
tmpfs                 2.4G     0  2.4G   0% /usr/local/abc/xyz

As you can see, / has just 4GB remaining and I'd like to use the un-allocated space from /home.

Is there anyway to do this?

I was able do this within when the contents where in the same partition but am clueless as to how this is to be done when contents are in different partitions.

p.s. I can't use GParted since my system doesn't support GUI.

Thanks!

asked 1 min ago

attaboy182

414