Theechocommand is used to display a line of text or string that is passed as an argument. It's one of the most basic and frequently used commands in Bash scripting. echo [option] [string] Printing text to the terminal: echo "Hello, World!" Output: Hello, World! Printing the value of...
echo 'Enter a number between 1 and 4:' echo 'The number you entered is:' read aNum case $aNum in 1) echo 'You have chosen 1' ;; 2) echo 'You have chosen 2' ;; 3) echo 'You have chosen 3' ;; 4) echo 'You have chosen 4' ;; *) echo 'You did not enter a number b...
· echo:返回在shell提示符下键入的内容,类似于在Python中打印。 · date:显示当前时间和日期。 · cal:显示当月的日历。 · 清除终端:按住Ctrl-L或删除清除终端。 Bash命令基本知识 Bash命令是Bash可以独立执行的最小代码单元。这些命令告诉Bash需要做什么。Bash通常从用户方接收单个命令,并在命令执行后返回给用户。
echo "Parameter #10 is ${10}" fi echo "---" echo "All the command-line parameters are: "$*"" if [ $# -lt "$MINPARAMS" ] then echo echo "This script needs at least $MINPARAMS command-line arguments!" fi echo exit 0 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13....
· echo:返回在shell提示符下键入的内容,类似于在Python中打印。 · date:显示当前时间和日期。 · cal:显示当月的日历。 · 清除终端:按住Ctrl-L或删除清除终端。 Bash命令基本知识 Bash命令是Bash可以独立执行的最小代码单元。这些命令告诉Bash需要做什么。Bash通常从用户方接收单个命令,并在命令执行后返回给用户...
To display the exit code for the last command you ran on the command line, use the following command: $echo$? The displayed response contains no pomp or circumstance. It's simply a number. You might also receive a shell error message from Bash further describing the error, but the exit ...
#We are now going back to standard output, by using echo and printing your name to the command line. echo "With standard input you have told me your name is: $name" 这个示例通过标准输出给出提示,提醒用户输入信息,然后从标准输入(键盘)获取信息,使用read将其存储在name变量中,并通过标准输出显示...
echo "Usage: " } # parse the options in the command line ARGS=$(getopt -a -o a:b:cdefg:k:h --long addr:,bus:,check,do,end,fun,good:,kick:,help -- "$@") if [ $? -ne 0 ]; then usage fi eval set -- "$ARGS"
/bin/bashfile="example.txt"# 检查文件是否存在if[ -f"$file"];then# 逐行读取文件whileIFS=read-r line;doecho"$line"done<"$file"elseecho"文件$file不存在"fi 在上述示例中,我们首先检查文件是否存在。如果文件存在,我们使用while循环来逐行读取文件。IFS=用于禁用行分隔符的自动修剪,确保原样读取每行的...
echo"Unknown option $1"exit1;;*)#对于所有其他非选项参数(即位置参数),将它们逐一添加到POSITIONAL_ARGS数组中,POSITIONAL_ARGS+=("$1")# 保存位置参数 shift;;esac done set--"${POSITIONAL_ARGS[@]}"# 将数组里的参数设置为当前 shell 的位置参数 ...