Delete all words not containing letter /s/


 
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# 1  
Delete all words not containing letter /s/

I have a word file that looks like:
Code:
pens
binder
spiral
user

I want to delete all the words without the letter /s/, so output looks like:
Code:
pens
spiral
user

I tried using sed:
Code:
sed '/[^Ss]/d' infile.txt > out.txt

The result is an empty text file... can anyone help?
# 2  
Code:
sed -n '/[Ss]/p' myFile

# 3  
Code:
cat filename | grep -iv s > outfile

# 4  
RedHat

cat filename | grep -i s > outfile
# 5  
Using Awk

Code:
awk 'BEGIN{IGNORECASE=1}/s/' filename

Code:
awk '/[Ss]/' filename

Code:
awk 'tolower($0)~/s/' filename

# 6  
You can also use

Code:
cat file2.txt
pens
binder
spiral
user

Code:
grep -iv 's' file2.txt > file3.txt

Code:
cat file3.txt
binder

 

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