使用sed和grep在file1中查找标题，并将内容移动到具有相同标题的file2

Question

i have file1 and file2

FILE1 :
title1 linkabc
title2 linkdef
title3 linkfgh
title4 linkdse
title5 linklsfr
title6 linkfhghg
title7 linksdrlk
title8 linklklghkj
title9 linkghftht

and in FILE2

FILE2 :
title1
anothertitle2
title3
anothertitle4
title5
anothertitle6
title7
anothertitle8
title9

as you can see in file2 there are no links only the title match , and i want to make the output like below

OUTPUT :
title1 linkabc
anothertitle2
title3 linkfgh
anothertitle4
title5 linklsfr
anothertitle6
title7 linksdrlk
anothertitle8
title9 linkghftht

As you can see if file1 and file2 title doesnt match leave as it is

i can pull the link with this command

cat FILE1 | grep "title1" | grep -oh link.*

i just cant figure out how to append output link to FILE2 .

after search test and failed again and again , i gave up , hope someone can help me solve this.

thank you!

*sorry edited my question was not clear im too confused already , my bad.

Answer 1

$ awk 'NR==FNR{a[$1]=$2; next} {print $1, a[$1]}' file1 file2


title1 linkabc
anothertitle2
title3 linkfgh
anothertitle4
title5 linklsfr
anothertitle6
title7 linksdrlk
anothertitle8
title9 linkghftht

Answer 2

There are a number of ways to achieve this, but a simple approach would be to take every line of FILE2 and then grep for this in FILE1 .

while read -r LINE; do if ! grep "^$LINE " FILE1; then echo $LINE; fi; done < FILE2

Or if you prefer, you can cat the file first:

cat FILE2 | while read -r LINE; do if ! grep "^$LINE " FILE1; then echo $LINE; fi; done

This will then just echo the LINE it's reading from FILE2 if there's no match in FILE1.

Example proof:

rseaman@Ubuntu-PC:~/temp$ cat FILE1
title1 linkabc
title2 linkdef
title3 linkfgh
title4 linkdse
title5 linklsfr
title6 linkfhghg
title7 linksdrlk
title8 linklklghkj
title9 linkghftht
rseaman@Ubuntu-PC:~/temp$ cat FILE2
title1
anothertitle2
title3
anothertitle4
title5
anothertitle6
title7
anothertitle8
title9
rseaman@Ubuntu-PC:~/temp$ while read -r LINE; do if ! grep "^$LINE " FILE1; then echo $LINE; fi; done < FILE2
title1 linkabc
anothertitle2
title3 linkfgh
anothertitle4
title5 linklsfr
anothertitle6
title7 linksdrlk
anothertitle8
title9 linkghftht

Answer 3

Updating answer because you updated the question

(grep -F -w -f file2 file1) && (grep -v -F -w -f <(cut -d' ' -f1 file1) file2)

will do what you seek, however it scrambles the input order. At this stage it probably makes sense to go with a more granular solution

bash-3.00$ (grep -F -w -f file2 file1) && (grep -v -F -w -f <(cut -d' ' -f1 file1) file2)
title1 linkabc
title3 linkfgh
title5 linklsfr
title7 linksdrlk
title9 linkghftht
anothertitle2
anothertitle4
anothertitle6
anothertitle8

---

grep -f file2 file1

This will perform a partial match taking the input from file 2

Here are the results

bash-3.00$ cat file1
title1 linkabc
title2 linkdef
title3 linkfgh
title4 linkdse
title5 linklsfr
title6 linkfhghg
title7 linksdrlk
title8 linklklghkj
title9 linkghftht
bash-3.00$ cat file2
title1
title3
title5
title7
title9
bash-3.00$ grep -f file2 file1
title1 linkabc
title3 linkfgh
title5 linklsfr
title7 linksdrlk
title9 linkghftht
bash-3.00$

Addressing Robert's query, if that were the case i would do grep -F -w -f file2 file1

bash-3.00$ cat file1
title1 linkabc
title2 linkdef
title3 linkfgh
title4 linkdse
title5 linklsfr
title6 linkfhghg
title7 linksdrlk
title8 linklklghkj
title9 linkghftht
title10 linkxyxyz
bash-3.00$
bash-3.00$
bash-3.00$
bash-3.00$ cat file2
title1
title3
title5
title7
title9
bash-3.00$
bash-3.00$
bash-3.00$
bash-3.00$ grep -F -w -f file2 file1
title1 linkabc
title3 linkfgh
title5 linklsfr
title7 linksdrlk
title9 linkghftht
bash-3.00$

Answer 4

After the update of the question You can try with gnu join :

join --nocheck-order -a 2 FILE1 FILE2

If you want to update FILE2

printf "$(join --nocheck-order -a 2 FILE1 FILE2)" >FILE2

Answer 5

This might work for you (GNU sed):

sed 's#\(.*\) .*#s/^\1$/&/#' file1 | sed -f - file2

Turn file1 into a sed script and run it against file2.

The script matches the key in file2 and replaces that line with the contents of the matching line from file1.