cat

  • displays the contents of a file at the command line
  • copies or apppend text file into a document
    cat [OPTIONS] .. [FILE]

head

  • prints the first part of the files
    head [ OPTION] … [FILE]

tail

  • prints the last part of files
    tail [OPTION] … [FILE] …

more

  • displays text , one screen at a time
    按空格翻页,按回车往下滚动行,按q退出

less

displays text, allows scrolling
按j下,按k上,按q退出

wc

“word count” prints a count of lines, words , and bytes for each file
wc [OPTION] … [FILE] …

grep

“global regular expression print ” processes text and prints any lines which match a specified pattern
grep [OPTIONS ] pattern [FILE]

cut

drops sections of each line of a file / files
cut OPTION … [FILE] …

tr

translates one set of characters to another
tr [-Ccsu] string1 string2

sort

sorts the contents of a text file
sort [OPTION] … [FILE] …

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