如何仅用1个命令收集2个awk命令

Question

I have the following output

$ cat /proc/net/route
Iface   Destination     Gateway         Flags   RefCnt  Use     Metric  Mask            MTU     Window  IRTT                               
br-lan  03043836        C0A80101        0007    0       0       5       FFFFFFFF        0       0       0                                  
br-lan  C0A80100        00000000        0001    0       0       0       FFFFFF00        0       0       0  

I use the awk to extract the line containing the Destination 03043836 and the Mask FFFFFFFF and then I use the awk another time to display the first elment from the extracted line:

$ dest=03043836; mask=FFFFFFFF; va=1;
$ cat /proc/net/route | awk '$2=="'"$dest"'" && $8=="'"$mask"'"' | awk '{print $'"$va"'}'
br-lan

Now I want to gather both awk commands in only one awk command. How to do that?

Answer 1

dest=03043836; mask=FFFFFFFF; va=1;
awk -v dest="$dest" -v mask="$mask" -v va="$va" '$2==dest && $8==mask {print $va}' /proc/net/route

-v is used to assign a value to a variable.

Answer 2

You can combine all three of them (including the cat which is needless here):

dest=03043836; mask=FFFFFFFF; va=1;

awk -v dest="${dest}" -v mask="${mask}" -v va="${va}" {print $va}' /proc/net/route

Answer 3

This is not an answer, just a couple of small examples demonstrating why you should use Ashkan's answer:

---------
$ x="hello world"

$ awk -v y="$x" 'BEGIN{print y}'
hello world

$ awk 'BEGIN{print "'"$x"'"}'
hello world

---------
$ x="hello
world"

$ awk -v y="$x" 'BEGIN{print y}'
hello
world

$ awk 'BEGIN{print "'"$x"'"}'
awk: cmd. line:1: BEGIN{print "hello
awk: cmd. line:1:             ^ unterminated string
awk: cmd. line:1: BEGIN{print "hello
awk: cmd. line:1:             ^ syntax error

---------
$ x="hello world\\"

$ awk -v y="$x" 'BEGIN{print y}'
hello world\

$ awk 'BEGIN{print "'"$x"'"}'
awk: cmd. line:1: BEGIN{print "hello world\"}
awk: cmd. line:1:             ^ unterminated string
awk: cmd. line:1: BEGIN{print "hello world\"}
awk: cmd. line:1:             ^ syntax error

How would you prefer your script to behave in the latter 2 cases?