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wc -l <file_name>

wc -l *

split [-l line count] [-b byte count] [file name]

split -l 100000 long.txt

xaa
xab

df -h

du -h

365M	./logs/dag_processor_manager
449M	./logs
450M	.

ll -sh

cat file_a.txt file_b.txt file_c.txt > merged.txt

cat <file_name_prexfix>*_part.txt >merged_file

sort long_list.txt | uniq > output_file.txt

sed 's/<phrase_a>/<phrase_b>/g' file.txt > output_file.txt

cat file_a >> file_b

ssh-keyscan -t rsa <host>

shutdowwn now