wc [-clw][file1 file2 … fileN]
wc stands for word count. clwstand for character, line and word.
Find how many files are in the presentdirectory: ls | wc -w
spell[file1 file2 … fileN]
ispell[file1file2 … fileN]
Check ASCII text files and outputs all thewords it considers misspellings.
cmpfile1 [file2]
cmpcomparetwo files and merely tell you where the two files first differ.
difffile1 file2
difftakes two parameters and displays the differencesbetween them on a line-by-line basis.
gzip[-v#] [file1 file2 … fileN]
gunzip[-v] [file1 file2 … fileN]
zcat[file1 file2 … fileN]
Compress and decompress data gzip, or GNUZip.
tr string1string2
The “translate characters” command operates onstandard input—it doesn’t accept a filename as a parameter. It replaces all occurrencesof string1 in the input with string2.
/home/larry# tr [:lower:] [:upper:]
This is a WEIRD sentence.
THIS IS A WEIRD SENTENCE.