java - Setting column width of a command output on AIX -

i'm trying parse df -pg command's output in java application, print me want.

here output of command:

filesystem    gb blocks      used available capacity mounted on /dev/hd4           1.00      0.30      0.70      31% / /dev/hd2           3.62      2.65      0.98      74% /usr /dev/hd9var        2.00      0.19      1.81      10% /var /dev/hd3           2.88      1.61      1.27      56% /tmp /dev/hd1           2.00      1.30      0.70      66% /home /proc                 -         -         -       -  /proc /dev/hd10opt       1.00      0.27      0.73      28% /opt /dev/fslv00        2.88      1.25      1.63      44% /tsmfiles /dev/fslv01        2.00      0.84      1.16      43% /opt/ibm/itm /dev/livedump      0.25      0.00      0.25       1% /var/adm/ras/livedump /dev/doonceaix      0.75      0.00      0.75       1% /doonceaix /dev/nmonlv        1.00      0.03      0.97       4% /var/perf/poa /dev/fslv02       49.50     42.86      6.64      87% /u01 /dev/fslv03      685.00    312.62    372.38      46% /u02 akslltsm:/depot     60.50     43.06     17.44      72% /mnt 

my parser in java splits text spacing size. read lines, parser splits string when hee sees @ least 1 space character. can see, there lines inside column (like "gb blocks" , "mounted on") can't split want.

what want set column width (2+ space characters) , program parse successfully.

catch special cases , fill in spaces, adjust columns, undo did in first step.

e.g.

step one: sed -e 's/gb blocks/gb_blocks/' -e 's/mounted on/mounted_on/'  second step: normal program adjusts columns  third step: sed -e 's/gb_blocks/gb blocks/' -e 's/mounted_on/mounted on/' 

then pipe them together:

sed -e ... | <your prog> | sed -e ... 

this general technique type of situation. if input isn't able parsed (using whatever definition need @ time), alter input work, parse it, reverse first alteration.