Bash , Sed shortcuts

bash_sed_freq_useful_stuff

Replace first character in each line with another
(Useful for annotatin label replaceing stuff)

inp_file.txt
  1 chrX_73833098_73834098
  1 chrX_73889652_73890652
  1 chrX_91194501_91195501
  1 chrX_92000157_92001157
  1 chrX_92106500_92107500

out_file.txt
  0 chrX_73833098_73834098
  0 chrX_73889652_73890652
  0 chrX_91194501_91195501
  0 chrX_92000157_92001157
  0 chrX_92106500_92107500
  
b sed 's/1/0/1' file