tuyau de coquille

# count line using pipe operation (|)
$ echo "Welcome" | wc -l
       1

# Count character 
$ echo "Welcome" | wc -c
        8

# Count line in the text file and list in sorted order
$ wc -l *.txt | sort -n
       2 requirements.txt
      83 log.txt
     123 log_bkp.txt
     208 total
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