I have this file:
file.txt:
4003f0: 48 83 ec 08 sub $0x8,%rsp
4003f4: e8 73 00 00 00 callq 40046c
I am trying to extract the opcodes from the middle. First I search the first element after the opcodes (sub and callq):
get_asm_index.awk:
BEGIN {
i_min = 1000000;
}
{
i = match($0, /[^ :0-9a-fA-F]/)
if(i < i_min)
i_min = i;
}
END {
print i_min;
}
After that I print the opcodes:
get_hexdump.awk:
{
i = match($0, /[:]/);
print substr($0, i+1, i_min-i-1);
}
Everything is working if I call the two awk files separately, but I get the following error when I group them in a shell script:
./do.sh: line 4: 48: command not found
The shell script:
do.sh:
#!/bin/bash
i_min=$(awk -f get_asm_index.awk file.txt)
$(awk -v i_min="$i_min" -f get_hexdump.awk file.txt)
Don't put the last command in $(). That will take stdout of the command within and put that in place of whatever is outside. So it could be used as value to set in a variable as in your line above, or it could be the spot where a parameter goes in a command line. In this case, you don't have anything else there, so you end up putting it in the spot where a command would go, and then the shell tries to execute it as a command.
In this example, it tries to execute 48 which is generally not going to be the name of a command.
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