CODEWITHSUNDEEP
shellunixgdb
perplex
perplex

Reputation: 159

How to store the output of a gdb command into a variable?

I'm trying to store the output of a gdb command into a gdb variable. I'm following the instruction from here. But when I print the variable it shows empty.

My pop_stack file contains this 

20
268435372

I use the following command to store the value 268435372 from the pop_stack into gdb variable $pop_ele. And try to print the value as hexadecimal. But the $pop_ele shows empty. 

(gdb) shell echo set \$pop_ele=\"$(tail -n 1 pop_stack)\"
(gdb) p/x $pop_ele

output: 

set $pop_ele="268435372"
$8 = 0x0

My desire output for p/x $pop_ele command is 0xfffffac

Please help.

Upvotes: 0

Views: 1745

Answers (1)

dash-o
dash-o

Reputation: 14452

With gdb 8.X, possible to use shell and source to execute commands that depends on external data.

shell echo set \$pop_ele=$(tail -n1 pop_stack) > gdb.tmp
source gdb.tmp

Upvotes: 1

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