Extract paths from string file using regex (Linux)

Question

I have a cache file containing text and paths to Linux files. I would like to extract these files using Linux regex, but I'm not sure how to do it. Here is a sample of what the cache file looks like:

/usr/bin/mk_cmds (not prelinkable)
/usr/bin/gcov:
/lib/libc-2.5.so [0xfff88e55]
    /lib/ld-2.5.so [0x7e786fcc]
/usr/lib/rpm/rpmdeps:
    /usr/lib/librpmbuild-4.4.so [0xdb141354]
    /usr/lib/librpm-4.4.so [0x4d8c8840]

Now here is what I would like to extract:

/usr/bin/mk_cmds
/usr/bin/gcov
/lib/libc-2.5.so
/lib/ld-2.5.so
/usr/lib/rpm/rpmdeps
/usr/lib/librpmbuild-4.4.so
/usr/lib/librpm-4.4.so

I tried a few things but none of them work (using grep):

^(.*/)?(?:$|(.+?)(?:(\.[^.]*$)|$))

'(\/.+?) '

Do you have any idea how I could do it? I have tried a few things but nothing worked. Thank you very much

I suggest you add more tags that are relative to your question, like regex as well as the way you use to extract them (bash, python etc..) — Antonis
– Antonis, Commented Jul 3, 2020 at 8:17
@Armion : What flags did you pass to grep? grep can handle 3 different kinds of regular expressions. For instance, the + you are using, would not work with grep's basic regular expressions. See the options -E and -P in grep. — user1934428
– user1934428, Commented Jul 3, 2020 at 10:47
With the assumptions that your pathnames begin with a / character and don't contain a white space or : character: grep -o '/[^[:space:]:]*' cachefile — M. Nejat Aydin
– M. Nejat Aydin, Commented Jul 4, 2020 at 2:09

Léa Gris · Accepted Answer · 2020-07-03 10:09:59Z

1

with:

sed -n 's/^[[:space:]]*$.\+$[: ]/\1/p' cachefile.txt

sed -n: Sed editor in no print mode

s/: Search the regex:
^[[:space:]]*: Search lines starting either with spaces or nothing
$.\+$: Capture 1 or more characters.
[: ]: Followed by a colon : or a space .
/\1/p: Print the Regex captured group 1.

Test and play with this Regex in regex101.com:

https://regex101.com/r/lFzvYq/2

edited Jul 3, 2020 at 10:09

answered Jul 3, 2020 at 10:03

Léa Gris

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pii_ke · Accepted Answer · 2020-07-03 13:01:10Z

1

Try

sed -n '/:$/{s/:$//;p}; /]$/{s/^ *\(.*\) \[0x[0-9a-f]*\]$/\1/;p}'

This assumes that there are only two kinds of required lines in the cache. The ones ending with : and the ones ending with ].

answered Jul 3, 2020 at 13:01

pii_ke

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