grep question...

[ampapa]

Whenever I try to run a grep from the command line it seems like it just hangs and does nothing... even the most basic command returns no results, is there something I'm missing here???

SNAG-0831.jpg

Anyone know what I'm missing??

Thanks,

[Thisisnotmyname]

you're not piping anything into the grep so it's attempting to read from standard in (command line). run some other command and pipe the output into the grep.

[manguvigo]

grep takes the input from a origin (pipe, file, direct input, etc...)

i.e.:

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grep -r "things" * 

(Search the word "things" on all the files recursively from actual folder)

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ls|grep .php

"pipes" the output of ls to the grep command, who only shows the output that contains ".php"

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cat things.txt | grep -v "word" 

Pipes the contain of the file "things.txt" and shows only the lines that DONT have the "word" on them

Look man or grep --help to find more

Some versions of QNAP don't have a full grep implementation, the ARM one I have don't support "-r" :

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[~] # grep -r
grep: invalid option -- 'r'
BusyBox v1.01 (2021.07.25-19:00+0000) multi-call binary

Options:
        -H      prefix output lines with filename where match was found
        -h      suppress the prefixing filename on output
        -i      ignore case distinctions
        -l      list names of files that match
        -n      print line number with output lines
        -q      be quiet. Returns 0 if result was found, 1 otherwise
        -v      select non-matching lines
        -s      suppress file open/read error messages

[ampapa]

There is no option for -r in this version or what is installed on the QNAP...

I'm trying to find files containing the letter "a"... output to the screen is fine

SNAG-0832.jpg

[ampapa]

Just following up here... grep in a stripped down version used in my QNAP doesn't appear to have a recursive function... odd.

grep seems to work...

SNAG-0834.jpg

Anyone have any ideas for recursively scanning test in files???

[ampapa]

Just closing the loop here... egrep is fully functional. I've moved away from grep.

Thanks,