how to move string from position to position in bash (sed, awk) - bash

Question

Please help me:)
How to move string from 4-line to under 1-line in bash (awk, sed)?
Example, i have a file:
line1
line2
line3
moveline4
result use SED, AWK and other utils:
line1
moveline4
line2
line3

Answer 1

Another approach with sed:
sed '2{N;h;d};4G;' file
Explanations:
2N: merges second and third line
h: stores both lines into the hold space
d: deletes both lines
4G: adds the pattern space content after fourth line

Answer 2

input file:
line1
line2
line3
moveline4
line5
line6
sed solution:
sed -n -e '1p' -e '4p' lines.txt; sed -n -e '2,3p' -e '5,$p' lines.txt
output:
line1
moveline4
line2
line3
line5
line6
You can redirect your ouput to a specific file (> and >>)
sed -n -e '1p' -e '4p' lines.txt > new_file.txt; sed -n -e '2,3p' -e '5,$p' lines.txt >> new_file.txt
explanation:
-n to avoid default printing of lines
-e to pass several commands to sed
1p to print the first line
4p to print the 4th line
2,3p to print the 2nd and 3rd line
5,$p to print the 5th line to the last line
awk solution:
awk 'NR==1||NR==4' lines.txt; awk 'NR>=2 && NR!=4' lines.txt
You can redirect your ouput to a specific file (> and >>)
awk 'NR==1||NR==4' lines.txt > new_file.txt; awk 'NR>=2 && NR!=4' lines.txt >> new_file.txt
explanation:
NR==1||NR==4 will make awk do its default action for number record 1 or 4 which is printing (lines 1 and 4)
NR>=2 && NR!=4 for lines >=2 and !=4 you print them
head/tail solution:
head -1 lines.txt; head -4 lines.txt| tail -1; head -3 lines.txt | tail -2; tail -n +5 lines.txt
for information about the behavior of head and tail please do man head and man tail
perl solution:
perl -ne 'print if 1..1' lines.txt; perl -ne 'print if 4..4' lines.txt; perl -ne 'print if 2..3' lines.txt; perl -ne 'print if 5..6' lines.txt
full bash solution:
#!/usr/bin/env bash
#print the 1st line
while IFS='' read -r line || [[ -n "$line" ]]; do
echo "$line"
break
done <"$1"
#print the 4th line
x=1
while IFS='' read -r line || [[ -n "$line" ]]; do
if [ $x -eq 4 ]; then
echo "$line"
break
fi
x=$((x+1))
done <"$1"
#print all lines except the 1st and the 4th
x=1
while IFS='' read -r line || [[ -n "$line" ]]; do
if [ $x -ne 1 -a $x -ne 4 ]; then
echo "$line"
fi
x=$((x+1))
done <"$1"
you can call the script ./myscript.sh lines.txt and redirect the output if necessary: ./myscript.sh lines.txt > new_file.txt