Question

I have to edit text file in android shell.

so I type this shell script.

but my Galaxy Nexus does not have Sed, Awk neither.

shell@android:/ $ sed -e "s/old_pattern/new_pattern/g" file_name > modify_file
/system/bin/sh: sed: not found

it doesn’t worked.

how can i modify old_pattern to new_pattern in text file.

is it possible in Shell Script?

Edited Shell Script

#!/system/bin/sh
ARGS=4
BAD=65

if [ $# -ne "$ARGS" ]
then
    echo "Usage: `basename $0` TARGET_FILE,OLD_PATTERN,NEW_PATTERN,MODIFY_FILE"
    exit $BAD
fi

old_pattern=$2
new_pattern=$3
modify_file=$4

if [ -f "$1" ]
then
    target_file=$1
else
    echo "\"$3\" Does not exist."
    exit $BAD
fi

exit 0

Solution :

shell@android:/ $ while read STRING
>do
>echo "${STRING//old_pattern/new_pattern}" >> modify_file_name
>done < target_file_name
shell@android:/ $ 

Answer 1

It is possible with pure bash, but it will be very slooow on big files.

while read STRING
do
    echo "${STRING//old_pattern/new_pattern}" >> modify_file
done < file_name

ps. Oh, I just mentioned that your shell isn’t bash. Seems like it is just sh. That won’t work with sh.