Shell finishing (25) ===== replacing uppercase and lowercase letters

This is my Sina blog, with all the shells I wrote

I wrote a lot of my own practice in the Sina blog Shell, I am going to write in 51, above is a hyperlink.

(a) accept an input and replace the first letter of the input string.

For example

[Email protected] hushuai]# bash 1.sh

Input word:ding Xue

Ding Xue

[Email protected] hushuai]#

The shell code is as follows:

#!/bin/bash

>file1 #每执行一次脚本清空次这个文件

Read-p "Input word:" ll #read-P is used to accept an input

echo $ll |xargs-n1>file # Xargs The user's input into a column, the role of the

The use of cat file |while read line #read reads one row at a time and assigns the line

Do

B= ' echo $line |cut-c1 ' # Number of lines on the loop how many times, take the first letter in each line

D= ' echo $line |cut-c2-' # reads each line to intercept the 2nd subsequent letter, i.e. every read

C= ' echo $b |tr ' A-Z ' A-Z ' a line, loop once, we'll split this line into two parts

Echo-n "$c $d" >>file1 # Details There is a space behind the $c$d, otherwise the output of each row will

Done compactly together.

Cat File1

echo # Use-N in the loop, make sure to write an echo at the end

Or they're going to be linked together.

Shell's version 2

#!/bin/bash

>bb

[-Z] && echo "Usage: ' basename $ ' word ' && exit # ' basename $ ' print out the name of the script

a=$# #$# number of statistical parameters, separated by spaces

echo [email protected] |xargs-n1 >aa #$@ means all the parameters passed in

For i in ' seq $a '

Do

c= ' Cat AA | Sed-n ' $i ' P ' |cut-c1 ' # comes in several loops, middle and

d= ' Cat AA | Sed-n ' $i ' P ' |cut-c2-' above the same principle

E= ' echo $c |tr ' A-Z ' A-Z '

Echo-n "$e $d" >>bb

Done

Cat BB

Echo

The core of the two is the same, we can also use SED to complete

For example:

[Email protected]/]# echo ding Xue | Sed-r ' s/([^]+)/\u&/g '

Ding Xue

[Email protected]/]#

I have some summary of the knowledge Inside:

For example: Xargs on two functions, the line into a column, one column for a row

[[email protected]/]# SEQ 3 |xargs

1 2 3

[[email protected]/]# SEQ 3 |xargs-n2

1 2

3

[[email protected]/]# seq 3 |xargs-n2 |xargs

1 2 3

If it is an accepted user input we generally use the Read command

There are generally two ways to do this:

(1) read-p "Input:" A

Echo $a

(2) echo-n "Input:" # details, I write-n is reasonable, otherwise the output is the first kind

Read Input condition. Not beautiful.

Echo $Input

Output Result:

[Email protected]/]# bash 18.sh

Input:

A

A

[Email protected]/]# bash 18.sh

Input:a

A

~

READ also has the usual read-s does not echo Read-t waits for the user to enter the longest time

Several common parameters that may be encountered in a script

For example:

#!/bin/bash

a=$#

Echo $a $# number of parameters passed in the statistics

[e-Mail protected] $@ the string passed in

Echo $b

~

Look at the effect:

[Email protected]/]# bash 16.sh ding xue

2

Ding Xue

[Email protected]/]#

echo $b | Xargs-n1 If you add such a bar, the result will be:

[Email protected]/]# bash 16.sh ding xue

2

Ding Xue

Ding

Xue

[Email protected]/]#

If we replace the article with this:

C= ' echo $b | Xargs-n1 '

Echo $c

The output changes to:

[Email protected]/]# bash 16.sh ding xue

2

Ding Xue

Ding Xue # This place becomes a horizontal arrangement, because with the anti-quote Shell will think that the vertical

[[Email protected]/]# things cross over. For example:

[[email protected]/]# echo ' seq 9 '

1 2 3 4 5 6 7 8 9

[Email protected]/]#

When we are affected by the read input, we often use:

#!/bin/bash

Read-p "Input:" A

b=${#a} # Number of statistics strings (including spaces)

Echo $b

Look at the results

[Email protected]/]# bash 15.sh

input:ding Xue

8 # 8 Explanations of what, the space is counted.

[Email protected]/]#

This article from "It Life" blog, declined reprint!

Shell finishing (25) ===== replacing uppercase and lowercase letters