问题
I want to remove negative words form sentence using bash script .
The negative words that i meant it :
[dull,boring,annoying,bad]
My file text text.txt contains this sentence :
These dull boring cards are part of a chaotic board game ,and bad for people
I'm using this script
array=( dull boring annoying bad )
for i in "${array[@]}"
do
cat $p | sed -e 's/\<$i\>//g'
done < my_text.txt
But I got the following wrong result:
These boring cards are part of a chaotic board game ,and bad for people
The correct output must be like this :
These cards are part of a chaotic board game ,and for people
回答1:
First, assuming $p is existed file Then used this Script
while read p
do
echo $p | sed -e 's/\<dull\>//g' | sed -e 's/\<boring\>//g' | sed -e 's/\<annoying\>//g'|sed -e 's/\<bad\>//g' > my_text.txt
cat my_text.txt
done < my_text.txt
The output of this script :
These cards are part of a chaotic board game ,and for people
Or can use this script, You have to use double quotes, not single quotes to get variables expanded.
array=( dull boring annoying bad )
for i in "${array[@]}"
do
sed -i -e "s/\<$i\>\s*//g" my_text.txt
done
The sed -i switch replace in line.
The sed -e to add the script to the commands to be executed.
To learn more about sed command you can used in your terminal man sed
回答2:
You want to run a single sed script, generated from the array.
printf 's/\\<%s\\>//g' "${array[@]}" |
sed -f - my_text.txt
If your sed does not accept -f - to read the script from standard input, you need to refactor a bit.
Similarly, \< and \> as word boundaries may not be supported by your sed; perhaps try \b in both places if you have a different dialect.
...or in the worst case switch to Perl if your sed is really spare. Though of course, maybe refactor out Bash altogether then, and do this entirely in Perl.
perl -pe 'BEGIN { $re = "\\b(" . join("|", qw(
dull boring annoying bad )) . ")\\b" }
s/$re//go' my_text.txt
来源：https://stackoverflow.com/questions/65873817/remove-specific-words-from-sentences-in-bash