Parse Linux df output with C# regular expressions

Question

How do I parse the df-Bk Linux command output with C# regular expressions?

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/sda1             7913216K  2348412K  5165992K  32% /
varrun                 257788K      108K   257680K   1% /var/run
varlock                257788K        0K   257788K   0% /var/lock
udev                   257788K       56K   257732K   1% /dev

I wish to get "1K-blocks" and "Used".

Can you show the example of command and describe what exactly you need to parse? — Sergey K
– Sergey K, Commented Jun 14, 2011 at 11:36
have you considered piping the output of df through awk first? (linuxfocus.org/English/September1999/article103.html) — Mihai Oprea
– Mihai Oprea, Commented Jun 14, 2011 at 13:22
How does your regex so far look like? Do you speak regex at all, or are you looking for code monkeys? — Sebastian Mach
– Sebastian Mach, Commented Jun 14, 2011 at 13:32

sorpigal · Accepted Answer · 2011-06-14 21:42:02Z

5

Regex is not a magic parsing bullet. Rather than try to parse with regex, why not get the output you want more directly and just read it?

df -Bk| awk '{print $2, $3}'

This will get you a set of lines with space-delimited fields. Parsing this becomes a matter of calling string.Split()

string[] output_lines; // presumably holds the output of df
for (int i = 0; i < output_lines.Length; i++)
{
    if (i == 0)
        continue;

    string[] b_u = output_lines[i].Split(" ");
    string blocks = b_u[0];
    string used = b_u[1];
}

answered Jun 14, 2011 at 21:42

sorpigal

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Qtax · Accepted Answer · 2011-06-14 13:26:50Z

0

You could use ^\S+\s+(\S+) or split on \s+, skip first line tho.

answered Jun 14, 2011 at 13:26

Qtax

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