i have some csv files in a directory which have sub-directories also. now how can i merge all .csv files in to one with a single header.
for example:
have some 4 files.
1.csv--------name,age,sal
abc,25,4000
2.csv--------name,age,sal
vgd,32,3500
3.csv--------name,age,sal
hfg,20,5000
4.csv--------name,age,sal
asd,15,2000
now my output file should be like

5.csv----------name,age,sal
abc,25,4000
vgd,32,3500
hfg,20,5000
asd,15,2000
and please explain the code for me. as i am new to scripting. thank you in advance


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