shell - Add preceding zeros to all lines in a file -

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i have simple text file containing random number on every line. wish add preceding zeros numbers less in digits. there way on command line (unix)

input file:

235 25 1 963258 45 1356924

output file:

0000235 0000025 0000001 0963258 0000045 1356924

using awk - printf:

$ cat testfile 235 25 1 963258 45 1356924 $ awk '{printf("%07d\n", $1)}' testfile  # %07d pad 0s. 0000235 0000025 0000001 0963258 0000045 1356924

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