$@: this contains all the input arguments $#: the number of arguments passed to the script $0: the name of the script itself Let’s further explain with an example: $ ./example.sh arg1 arg2 arg3 Here, we can use the various types of special variables. The special parameter$@represent...
done #结束for循环 echo"FILE EXTENSION = ${EXTENSION}"echo"SEARCH PATH = ${SEARCHPATH}"echo"DEFAULT = ${DEFAULT}"echo"Number files in SEARCH PATH with EXTENSION:"$(ls-1"${SEARCHPATH}"/*."${EXTENSION}" | wc -l) if [[ -n $1 ]]; then echo "The non option arguments are:" $@...
trap cleanup SIGINT SIGTERM ERR EXIT script_dir=$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd -P) usage() { cat <<EOF Usage: $(basename "${BASH_SOURCE[0]}") [-h] [-v] [-f] -p param_value arg1 [arg2...] Script description here. Available options: -h, ...
# A small example program for using the new getopt(1) program. # This program will only work with bash(1) # An similar program using the tcsh(1) script language can be found # as parse.tcsh # Example input and output (from the bash prompt): # ./parse.bash -a par1 'another arg...
3. Using Variables for Command-Line Arguments A common approach to changing command-line arguments within a script is to assign them to variables. Therefore,instead of directly modifying the arguments, we copy their values in variables and modify these variables. Thus, we can manipulate the argume...
# This program will only work with bash(1) # An similar programusingthe tcsh(1) script language can be found #asparse.tcsh # Example input and output (from the bash prompt): # ./parse.bash-a par1'another arg'--c-long'wow!*\?'-cmore-b"very long" ...
From utilizing the exit status of shell commands to controlling the flow of a script with if-elseif-else statements, bash scripts allow you to harness the power of the command line to perform complex operations. By using file permissions, you can make sure that only a valid user can access...
20天学会bash shell script. (二)shell 算数表达式 语法格式: expr oprand1 math-operator op2 算数运算符: +,- 加,减 *, / 乘,处 % 取模 [linux@zeng bin]$ cat math.sh #!/bin/bash # #This shell script. about shell arithmetic. expr 4 + 1 expr 5 - 1 expr 20 / 4 expr 10 % 3 ...
用户可以对自己的运行环境进行定制，其方法就是修改相应的系统环境变量。 常见的环境变量： PATH： ...
echo -e "Example: ${BOLD}$SCRIPT -a foo -b man -c chu -d bar file.ext${NORM}"\\n exit 1 } #Check the number of arguments. If none are passed, print help and exit. NUMARGS=$# echo -e \\n"Number of arguments: $NUMARGS" ...