Shell编程- 文件

The following is the most frequently used file command

1 cat, show file content
    cat zdd.txt, show content of zdd.txt
    cat file1 file2 ... filen
    -n, show line number
    -b, skip empty line

2 wc, count the character, word, and line of a file
    wc zdd.txt (multiple file is ok, wc file1 file2 ... filen)
output:
    53  276 1620 zdd.txt - 53 lines, 276 words, 1620 characters
    -l, count line
    -w, count word
    -c, count character
    if no argument provide, count all of the 3 above

3 cp, make a copy of a file, this command has no output except it encounterd an error
    cp source, dest
    cp file1 file2, create a copy of file1 in the same folder
    cp file1 directory1, create a copy of file1 under directory1, cp zdd.txt Work/ , create a copy of zdd.txt under folder 'Work'
    cp file1 file2 ... filen dir, copy file1 - filen to folder 'dir', note in this case, dir must be a foler!
    -i, interactive mode, promote before overwrite

4 mv, rename file
    mv source, dest
    mv zdd.txt ddz.txt, rename zdd.txt to ddz.txt
    -i, interactive mode, promote for overwirte(ddz.txt already exist)

4.1 mv, move source files to destiny directory

5 rm, delete file
    rm file1 file2 ... filen
    -i, interactive mode, promote before delete(delete file is unrecoverable)