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# compress/decompress zip file. 
zip file.csv.zip file.csv
unzip file.csv.zip

# compress/decompress gz file. 
gzip file.csv
gzip -d file.csv.gz

# compress/decompress bz2 file. 
bzip2 file.csv
bzip2 -d file.csv.bz2

# compress/decompress tar.gz file. 
tar zcvf file.csv.tar.gz file.csv
tar zxvf file.csv.tar.gz

# compress/decompress tar.bz2 file. 
tar jcvf file.csv.tar.bz2 file.csv
tar jxvf file.csv.tar.bz2

# compress/decompress 7z file
7z a file.7z file1.csv file2.csv
7z x file.7z

# repair zip file.
zip -FF file.zip --output file_repaired.zip

# split a file.(output file.aa, file.ab).
split -b 100M file.tsv.bz2 file.

# conbine some files.
cat file.aa file.ab > file.tsv.bz2

# check the process with high memory usage.
ps alx  | awk '{printf ("%d\t%s\n", $8,$13)}' | sort -nr | head -10

# check the number of cores.
cat /proc/cpuinfo | grep -c "processor"

# find files and remove them.
find ./ -type f -name "*.txt"  -print0 | xargs -0 rm