NettetWhen you evaluate a expression inside test operator [], it should return an exit code of 0 for the expression evaluating to true and non-zero if false. [ $i -lt 10 ] is saying i (5) is less than 10, so it returns an exit code of 0. – Vikyboss Feb 10, 2016 at 17:52 1 I would suggest you to read man page of 'test' and 'bash'. – Vikyboss Nettet5. des. 2024 · The syntax of the while command is: while test-commands; do consequent-commands ; done. Execute consequent-commands as long as test-commands has an …
bash - How to ping in linux until host is known? - Server Fault
Nettet15. sep. 2024 · 3 Answers. The syntax of while loops in csh is different from that of Bourne-like shells. It's: When csh is interactive, for some reason, that end has to … Nettet20. mar. 2012 · linux作为局域网网关的时候.笔者最关心的是怎么限制局域网的arp,怎么查看所有机器的流量.防止arp好说,直接绑定mac对应ip才可以上网就可以了.但是查看流量一直是笔者的一大心病.今天当笔者再次搜索相关方面的文件时终于看到希望. how do cars react in zero temperatures
Bash while loop usage with examples for beginners
NettetYou can do a loop, send one ping and depending on the status break the loop, for example (bash): while true; do ping -c1 www.google.com > /dev/null && break; done Putting this somewhere in your script will block, until www.google.com is pingable. Share Improve this answer Follow edited Oct 11, 2013 at 13:54 squillman 37.7k 11 91 146 Nettetwhile : ; do something ; done & Earlier Bourne shells didn't have true and false as built-in commands. true was instead simply aliased to :, and false to something like let 0. & at … Nettet為了確保這一點，我正在嘗試編寫一個 bash 腳本，該腳本將在啟動時運行，執行我的主應用程序，並在出現故障（錯誤、異常等）時再次執行它。 這是我的腳本： #!/bin/bash … how do cars recharge their batteries