>cmd="/usr/bin/gdb -q --batch -ex 'thread apply all bt full' /proc/8969/exe /tmp/core.xxx"
>ret=`$cmd`
Excess command line arguments ignored. (bt ...)
apply: No such file or directory.
/etc/all: No such file or directory.
Undefined command: "". Try "help".
>echo $ret
>
But -ex 'thread apply all bt full' change to -ex 'bt', the result is correct. I don't know why,and how to fix it.
type /usr/bin/gdb -q --batch -ex 'thread apply all bt full' /proc/8969/exe /tmp/core.xxx" in command line and execute success
cmd="/usr/bin/gdb -q --batch -ex 'thread apply all bt full' /proc/8969/exe /tmp/core.xxx
ret=`$cmd`
After parameter expansion of $cmd, the shell will do field splitting, which splits using the delimiters in $IFS (typically white space). This results in the following fields:
This tells GDB to execute a command named 'thread, and to debug an executable named apply and core file all.
One way to get the results you want is to run
ret=`eval "$cmd"`
echo "$ret" # use quotes here to preserve newlines
If you use bash or other modern shells that support arrays, this might be better:
gdbargs=(-q --batch -ex 'thread apply all bt full' /proc/8969/exe /tmp/core.xxx)
ret=`/usr/bin/gdb "${gdbargs[@]"}`
echo "$ret"