replace text with sed
sed -i 's/old-text/new-text/g' input.txt
sed replace with newline
For substituting with newline use sed command to replace a match with a
not used char and tr command to replace that char with a newline 'n'
#For example:
echo "123." | sed -E 's/([[:digit:]]*)./1|next line/' | tr '|' 'n'
replace a newline using sed linux bash
#All alternatives, unlike sed will not need to reach the last line to begin the process
#with bash, slow
while read line; do printf "%s" "$line "; done < file
#with perl, sed-like speed
perl -p -e 's/n/ /' file
#with tr, faster than sed, can replace by one character only
tr 'n' ' ' < file
#with paste, tr-like speed, can replace by one character only
paste -s -d ' ' file
#with awk, tr-like speed
awk 1 ORS=' ' file
#Other alternative like "echo $(< file)" is slow, works only on small files and needs to process the whole file to begin the process.
sed match newline
sed 's/n/[replacement]/g' file #Use this command to replace newlines
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