Reading files · ⁨读取文件⁩

Watch lesson · ⁨观看课程⁩

English

Reading a file

cat prints a file's contents straight to the screen:

It is named after "concatenate" — it can also join several files together.

中文

读取文件

cat 把文件内容直接打印到屏幕上:

cat poem.txt

它的名字来自 “concatenate(连接)” —— 它也能把好几个文件拼接在一起。

head 显示开头几行,tail 显示结尾几行,wc 统计行数

English

Just the start or end

For a long file you often want only a peek:
head shows the first lines, tail shows the last lines.

The -n option chooses how many lines.

中文

只看开头或结尾

对于很长的文件,你常常只想瞄一眼:
head 显示开头几行,tail 显示结尾几行。

head -n 2 poem.txt
tail -n 1 poem.txt

-n 选项用来选择显示多少行。

English

Counting

wc (word count) measures a file. The most useful option is -l for lines:

wc -w counts words and wc -c counts characters. Now try the tasks.

中文

计数

wc(word count,字数统计)用来度量一个文件。最常用的选项是 -l,统计行数:

wc -l poem.txt

wc -w 统计单词数,wc -c 统计字符数。现在来试试任务吧。

Use cat to print the whole contents of poem.txt. · ⁨用 cat 打印出 poem.txt 的全部内容。⁩

How many lines does the poem have? Use wc -l poem.txt to count them. · ⁨这首诗有多少行?用 wc -l poem.txt 数一数。⁩