CODEWITHSUNDEEP
linuxbashshell
Sijith
Sijith

Reputation: 3922

Convert first letter of given file to lower case

I want to convert the 1st letter of each line to lower case up to the end of the file. How can I do this using shell scripting?

I tried this:

plat=`echo $plat |cut -c1 |tr [:upper:] [:lower:]``echo $plat |cut -c2-`

but this converts only the first character to lower case.

My file looks like this:

Apple
Orange
Grape

Expected result:

apple
orange
grape

Upvotes: 9

Views: 9263

Answers (4)

Jérôme Kunegis
Jérôme Kunegis

Reputation: 276

Here is a single sed command that uses only POSIX sed features:

sed -e 'h;s,^\(.\).*$,\1,;y,ABCDEFGHIJKLMNOPQRSTUVWXYZ,abcdefghijklmnopqrstuvwxyz,;G;s,\
.,,'

These are two lines, the first line ending in a backslash to quote the newline character.

Upvotes: 0

Fritz G. Mehner
Fritz G. Mehner

Reputation: 17188

Pure Bash 4.0+ , parameter substitution:

>"$outfile"                         # empty output file
while read ; do
    echo "${REPLY,}" >> "$outfile"  # 1. character to lowercase
done < "$infile"  
mv "$outfile" "$infile"

Upvotes: 2

codaddict
codaddict

Reputation: 454912

Try:

plat=`echo $plat |cut -c1 |tr '[:upper:]' '[:lower:]'``echo $plat |cut -c2-`

Upvotes: 2

Mat
Mat

Reputation: 206659

You can do that with sed:

sed -e 's/./\L&/' Shell.txt

(Probably safer to do

sed -e 's/^./\L&\E/' Shell.txt

if you ever want to extend this.)

Upvotes: 12

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