额外显示文件信息的脚本

文章由LinuxBoy分享于2019-03-24 07:03:46热评（662）

额外显示文件信息的脚本

为了让用户更加便捷的了解到文件的内容，从而对用户提供帮助，该脚本的目的就是可以在显示文件本身内容的基础上，再多归纳总结几行。

#!/bin/sh

# showfile.sh -- 展示一个文件的内容, 也包括有用的额外信息

width=72

for input

lines="$(wc -l < $input | sed 's/ //g')"

chars="$(wc -c < $input | sed 's/ //g')"

owner="$(ls -ld $input | awk '{print $3}')"

echo "----------------------------------------------------------"

echo "File $input($lines lines, $chars characters, owned by $owner):"

echo "----------------------------------------------------------"

while read line

if [ ${#line} -gt "$width" ]; then

echo "$line" | fmt.sh | sed -e '1s/^/ /' -e '2,$s/^/+ /'

else

echo "$line"

done < $input

echo "----------------------------------------------------------"

done | more

exit 0

这个脚本的功能，大家应该看到了，多出了一些形象化的说明，统计了行数和字符数。在显示每行的内容时，最多显示72个字符，倘若多于72个，那么就截断为多行。这个脚本中最难的地方就在截断显示这儿：

echo "$line" | fmt.sh | sed -e '1s/^/ /' -e '2,$s/^/+ /'

它调用了第14个脚本fmt.sh，用来格式化输出用，最后一个管道的作用是:

第一个sed表达式是把传过来的第一行的首字母处加上一个空格；

第二个sed表达式是把第2行到最后一行的每行的首字母处都添加上一个加号和一个空格；

测试下这个脚本：

$ showfile ragged.txt

-----------------------------------------------------------------

File ragged.txt (7 lines, 639 characters, owned by taylor):

-----------------------------------------------------------------

So she sat on, with closed eyes, and half believed herself in

Wonderland, though she knew she had but to open them again, and

all would change to dull reality--the grass would be only rustling

+ in the wind, and the pool rippling to the waving of the reeds--the

rattling teacups would change to tinkling sheep-bells, and the

Queen's shrill cries to the voice of the shepherd boy--and the

sneeze

of the baby, the shriek of the Gryphon, and all the other queer

+ noises, would change (she knew) to the confused clamour of the busy

+ farm-yard--while the lowing of the cattle in the distance would

+ take the place of the Mock Turtle's heavy sobs.

-----------------------------------------------------------------

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额外显示文件信息的脚本