如果if结构使用的不是test命令,而是普通命令,比如上一节的((...))算术运算,或者test命令与普通命令混用,那么可以使用 Bash 的命令控制操作符&&(AND)和||(OR),进行多个命令的逻辑运算。$ command1 && command2 $ command1 || command2对于&&操作符,先执行command1,只有command1执行成功后, 才会执行command2。
# Check if a command is successful if ls then echo "Command succeeded" else echo "Command failed" fi ``` 通过使用if-else语句,用户可以根据不同的条件执行不同的操作。这使得Bash脚本更加灵活和强大,可以满足各种不同的需求。同时,if-else语句也可以嵌套在其他if-else语句中,以实现更复杂的逻辑控制。 ...
check_command() { if ! command -v ifconfig >/dev/null 2>&1; then echo -e "\033[31mifconfig命令不存在,正在下载安装!\033[0m" if os="ubuntu"; then apt install -y net-tools >/dev/null 2>&1 elif os="centos"; then yum install -y net-tools >/dev/null 2>&1 elif os="fedor...
Required commands check failed Files checked: 137 Suspect files: 4 Rootkit checks... Rootkits checked : 311 Possible rootkits: 0 Applications checks... Applications checked: 3 Suspect applications: 1 The system checks took: 6 minutes and 41 seconds 在Linux终端使用rkhunter来检测,最大的好处在于每项...
[$job_no]} if [[ $HAS_FAILED_JOBS -eq 0 ]] && [[ $job_stat -ne 0 ]]; then HAS_FAILED_JOBS=1 fi echo "Job=$job_id Status=$job_stat Command='$job_defs' LogPath='$LOG_DIR/${job_id}.log'" >> $LOG_DIR/$RESULT_FILE done echo -e "Task '$TASK_NAME' end at $END_...
通常容易被rootkit替换的系统程序有login、ls、ps、ifconfig、du、find、netstat等,其中login程序是最经常被替换的,因为当访问Linux时,无论是通过本地登录还是远程登录,/bin/login程序都会运行,系统将通过/bin/login来收集并核对用户的账号和密码,而rootkit就是利用这个程序的特点,使用一个带有根权限后门密码的/bin/...
While ShellCheck is mostly intended for interactive use, it can easily be added to builds or test suites. It makes canonical use of exit codes, so you can just add ashellcheckcommand as part of the process. For example, in a Makefile: ...
Goal When attempting to perform chroot the following error is shown [root@test ]$ chroot /mnt/ /bin/bash chroot: failed to run command ‘/bin/bash’:
If the exit status is not equal to zero, the ‘else’ block is executed, which prints a message indicating that the command has failed. Here’s a simple example to illustrate how we can use an ‘if’ statement to check the exit status of a command: ...
if [ -f "$filepath" ]; then echo "文件存在" else echo "文件不存在" fi 接下来,可以使用grep命令在文件中搜索指定内容,并使用-n参数显示行号: 代码语言:txt 复制 read -p "请输入要搜索的内容:" keyword grep -n "$keyword" "$filepath" 如果要检查确切位置,可以使用awk命令来处理输出结果,提取出...