Bash isolate result

Question

I start in bash and I would like to realize a script that checks the data on the command ibstat Ibstat returns this for example:

command ibstat
Ibstat returns this for example:

# ibstat
CA 'mlx4_0'
        CA type: MT25418
        Number of ports: 2
        Firmware version: 2.3.0
        Hardware version: a0
        Node GUID: 0x0002c9030002fb04
        System image GUID: 0x0002c9030002fb07
        Port 1:
                State: Active
                Physical state: LinkUp
                Rate: 20
                Base lid: 2
                LMC: 0
                SM lid: 1
                Capability mask: 0x02510868
                Port GUID: 0x0002c9030002fb05
        Port 2:
                State: Down
                Physical state: Polling
                Rate: 10
                Base lid: 0
                LMC: 0
                SM lid: 0
                Capability mask: 0x02510868
                Port GUID: 0x0002c9030002fb06

I would like for each port to check that Physical state: is equal to LinkUp otherwise I return an error. I arrive with grep and awq to isolate the 1st Physical state, but how do we make a kind of for loop to check each "node" port?

this is my actual code:

ibstat | grep "Physical state" | awk '{ print $3 }'

i want to separate Port number (in for or while ?)

For output result i want a error message like : "Error port 2 is not linkup"

Answer 1

Updated Answer

As awk is no longer acceptable (!), here is a bash version:

ibstat | while IFS=':' read f1 f2; do
   # If first field is "Port", remember port in variable $p
   [[ $f1 =~ .*Port.* ]] && p="$f1"
   # If first field is "Physical state"
   if [[ "$f1" =~ "Physical state" ]]; then
      # Just carry on if second field is "LinkUp"
      [[ $f2 =~ "LinkUp" ]] && continue
      echo "ERROR: $p is not LinkUp ($f2)"
   fi
done

Obviously you would put in a script, called CheckLink like this:

#!/bin/bash
while IFS=':' read f1 f2; do
   # If first field is "Port", remember port in variable $p
   [[ $f1 =~ .*Port.* ]] && p="$f1"
   # If first field is "Physical state"
   if [[ "$f1" =~ "Physical state" ]]; then
      # Just carry on if second field is "LinkUp"
      [[ $f2 =~ "LinkUp" ]] && continue
      echo "ERROR: $p is not LinkUp ($f2)"
   fi
done

and make it executable with:

chmod +x CheckLink

and then run it with

ibstat | ./CheckLink

Sample Output

ERROR:         Port 2 is not LinkUp ( Polling)

---

Original Answer

How about this:

ibstat | awk -F: '$1~/Port [0-9]+/{p=$1} /Physical state:/ && ! /LinkUp/{print p,$2}'

Sample Output

Port 2  Polling

So, every time we see Port followed by a space and some digits, we remember the port in variable p. Every time we see Physical state: but not with LinkUp on the same line, we print the port number we saved and the second field on the line.

---

Or, if you want quick, dirty and simple, you could just grep all the Ports and all the Physical states:

ibstat | grep -E "Port \d+:|Physical state:"

Sample Output

    Port 1:
            Physical state: LinkUp
    Port 2:
            Physical state: Polling