Using cat and pipeline to execute script


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# 1  
Using cat and pipeline to execute script

hi this is a homework assignment i need some help with

it mostly works.

script file

Code:
#!/usr/bin/env bash

#create dictionary file
grep -E '.{3}' /usr/share/dict/british-english > db.txt

#create remove_word to test file
touch removeW.txt

#palindrome function
palin()
{
        sed 's/[0-9]*//g;s/[/\._-]//g'\
	|tr -d '[[:punct:][:digit:]@]' \
    	| sed -E -e '/^(.)\1+$/d' \
    	| tr -s '[[:space:]]' \
    	| tr '[[:space:]]' '\n'        
}

paste <(palin <"$1") <(palin <"$1" | rev) \
  | awk '$1 == $2 && (length($1) >= 3) { print $1 }' \
  | sort | uniq -ic > done.txt

#removes repeated letters 
awk '{l=$0; if (length($2)!=gsub(substr($2,1,1), "", $2)) print l}' done.txt > finish.txt

#compares text files to remove words
grep -vwF -f db.txt finish.txt > removeW.txt|
grep -vwF -f removeW.txt finish.txt|
awk '!/ere|eke/'

#rm db.txt finish.txt removeW.txt done.txt

i can get this command to work

Code:
./script textfile

and it gives mostly the correct output.

but i also want to be able to invoke a command such as

Code:
cat textfile | script > outputfile

i'm not sure where to add the arguments in the script. I tried adding parameters on the paste line but get errors that file/directory not existing. I also tried an if statement, something i found.

Code:
if (($#)) ; then
     process "$1"
else
     cat | process
fi

tried different statements but it didn't work.

i'm using ubuntu lastest version i think.

any hints or help would be great thank you.

Last edited by crepe6; 11-19-2017 at 10:54 PM.. Reason: formatting
# 2  
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