Re: [bug-gawk] Match field one and print field three

[arnold]

Hi.

You need to write it this way:

     $ ldd lib/.libs/libidn.so | awk '$1 ~ /^libasan\.so\..*/ {print $3}'

The == is a string comparison, meaning an exact comparison; the ~ does
a regular expression match.

HTH,

Arnold

Jeffrey Walton <address@hidden> wrote:

> Hi Everyone,
>
> I'm having trouble testing a library. To test the library I need to
> LD_PRELOAD another another library. The rub is, the library is paired
> with the compiler, so I have to wait for the artifact to be built and
> then have ldd tell me which library to use.
>
> The awk below needs to find libasan.so.* in field one, then then print
> field three:
>
> $ ldd lib/.libs/libidn.so
>         linux-vdso.so.1 (0x00007ffd1bd9e000)
>         libasan.so.5 => /lib64/libasan.so.5 (0x00007ff41339c000)
>         libdl.so.2 => /lib64/libdl.so.2 (0x00007ff413396000)
>         libpthread.so.0 => /lib64/libpthread.so.0 (0x00007ff413374000)
>         libc.so.6 => /lib64/libc.so.6 (0x00007ff4131ae000)
>         librt.so.1 => /lib64/librt.so.1 (0x00007ff4131a4000)
>         libstdc++.so.6 => /lib64/libstdc++.so.6 (0x00007ff41300c000)
>         libm.so.6 => /lib64/libm.so.6 (0x00007ff412e86000)
>         libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007ff412e6b000)
>         /lib64/ld-linux-x86-64.so.2 (0x00007ff4141c6000)
>
> However, the result of the awk is empty so I am doing something wrong:
>
>     $ ldd lib/.libs/libidn.so | awk '$1 == "libasan.so.*" {print $3}'
>     $
>
> How do I fix the awk?
>
> In case it is needed:
>
> $ awk --version
> GNU Awk 4.2.1, API: 2.0 (GNU MPFR 3.1.6-p2, GNU MP 6.1.2)