2014 Ma linux0218-4 shift rotation and the last big question

Write a script so that the parameters can be computed regardless of the number of arguments followed by the script:

#!/bin/bash

Sum=0

For i in ' seq 1 $# ';d o

Let sum+=$1

Shift

Done

Echo $sum

Write a script that uses the following form

Userinfo.sh-u username [-v{1|2}]

The-u option is used to specify the user, and the script displays the user's UID and GID;

If you use the-V option at the same time:

If the value after-V is 1, the user's home directory path is displayed additionally

If the value after-V is 2, the user's home directory path and Shell are displayed extra

#!/bin/bash

#

[$#-lt 2] && echo "Too less arguments, quit." && exit 3

#上面一句是当参数不足2个的时候, Force quit

if [["$" = = "-U"]];then

Username= "$"

Shift 2

Fi

#上段功能是确认参数-U, write the following arguments to the variable username, and then turn the first two parameters out

If [$#-ge 2] && ["$" = = "-V"];then

Verflag=$2

Fi

#上段功能是当轮替后参数等于2, and the first parameter equals-V, the second argument is written to the Verflag variable

VERFLAG=${VERFLAG:-0}

#默认变量verFlag为0

If [-N $verFlag];then #如果变量verFlag不为空

if! [[$verFlag =~ [012]]];then #如果变量verFlag不属于012中任何一个

echo "wrong parameter."

echo "Usage: ' basename '-u username-v {1|2}"

Exit 4

Fi

Fi

# echo $userName $verFlag This sentence is for testing.

If [$verFlag-eq 1];then

grep "^ $userName"/etc/passwd | Cut-d:-f1,3,4,6

elif [$verFlag-eq 2];then

grep "^ $userName"/etc/passwd | Cut-d:-f1,3,4,6,7

Else

grep "^ $userName"/etc/passwd | Cut-d:-f1,3,4

Fi

The final question is a bit of difficulty, the feeling belongs to the horse's impromptu play, after all, did not draw a flowchart.

2014 Ma linux0218-4 shift rotation and the last big question