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Appending content of a file to another file before a specific character

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# 1  
Old 02-14-2019
Appending content of a file to another file before a specific character
Hi there,

i've got a file with this content

Code:
[matt@matt01 tmp]$ cat file1
Matt
Mar

The other file has the same number of lines with this content:
Code:
[matt@matt01 tmp]$ cat file2
20404=767294
23450=32427

is there a way with either using sed, awk or paste to insert the content of file1 before the "=" character? So I'll end up with this:
Code:
20404_Matt=767294
23450_Mar=32427

--- Post updated at 06:29 PM ---

I have found a workaround with paste and awk

Code:
paste -d "=" file1 file2 | awk -F "=" '{print$2"("$1")="$3}'

# 2  
Old 02-14-2019
Code:
awk -F= 'FNR==NR{f1[FNR]=$0;next} {print $1 "_" f1[FNR], $2}' file1 OFS="=" file2

This User Gave Thanks to vgersh99 For This Post:
nms
# 3  
Old 02-14-2019
Code:
awk '(getline tmp < "file1") { print $1 "_" tmp FS $2}' FS="=" file2

This User Gave Thanks to nezabudka For This Post:
nms
# 4  
Old 02-14-2019
Code:
awk '!/=/ {line[FNR]="_"$0} /=/ && $1=$1 line[FNR]' file1 FS== OFS== file2

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