Automatically enter input in command line not work

Question

It's similar with Automatically enter input in command line. But this not work in my situation.

What I want is after run gdb, I want it automatic input target remote:1337. Which I script like this:

printf 'target remote:1337\n' | gdb

But the gdb exit automatic after run the script. The log is:

printf 'target remote:1337\n' | gdb
GNU gdb (GDB) 8.3
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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    <http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
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(gdb) Remote debugging using :1337
Reading /data/local/tmp/helloworld.out from remote target...
warning: File transfers from remote targets can be slow. Use "set sysroot" to access files locally instead.
Reading /data/local/tmp/helloworld.out from remote target...
Reading symbols from target:/data/local/tmp/helloworld.out...
_start () at helloworld.s:5
5       blx _thumb
(gdb) quit
A debugging session is active.
Inferior 1 [process 11826] will be killed.


Quit anyway? (y or n) [answered Y; input not from terminal]

If I do this manually. It can work normally.

How to fix? Thank you!

score 3 · Accepted Answer · answered Jan 06 '21 at 06:45

You don't need this for gdb. You can specify an initial command using -ex or commands from a file using -x (or use .gdbinit files instead). From the manpage:

-command=file
-x file
   Execute GDB commands from file file.
-ex command
   Execute given GDB command.

Example with -ex:

% gdb -ex 'target remote localhost:1337'
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
...
Type "apropos word" to search for commands related to "word".
Remote debugging using localhost:1337
(gdb)

Or with -x and a file:

% echo 'target remote localhost:1337' > foo                       
% gdb -x foo                            
GNU gdb (GDB) 10.1
Copyright (C) 2020 Free Software Foundation, Inc.
...
0x00007ffff7fd2090 in _start () from target:/lib64/ld-linux-x86-64.so.2
(gdb)

Automatically enter input in command line not work

1 Answers1