replace text with sed
sed -i 's/old-text/new-text/g' input.txtsed replace
For using match in sed replacement, just border it with '(' and ')':
echo Before123 | sed 's/Before([0-9]*)/1After/g'
123After # number is matched withtin '( )' and replaced in '1'
Example with 2 match replacements
echo a_b | sed 's/(^.*)_(.*$)/first is 1 and 2 is after/g'replace a newline using sed linux bash
#All alternatives, unlike sed will not need to reach the last line to begin the process
#with bash, slow
while read line; do printf "%s" "$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.Copyright © 2021 Codeinu
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