environment variablesvsshell variables 全局系统环境变量 / 局部shell环境变量 https://www.cnblogs.com/xgqfrms/p/17686492.html refs https://www.cnblogs.com/xgqfrms/p/15937724.html https://stackoverflow.com/questions/592620/how-can-i-check-if-a-program-exists-from-a-bash-script ...
When making a symbolic link, check the command twice before you run it because several things can go wrong. For example, if you reverse the order of the arguments (ln -s linkname target), you’re in for some fun if linkname is a directory that already exists. If this is the case (a...
Show/set/delete environment variables. envsubst Substitute environment variable values in shell format strings. esd Start the Enlightenment Sound Daemon (EsounD or esd). Enables multiple applications to access the same audio device simultaneously. esd-config Manage EsounD configuration. esdcat Use EsounD ...
This chapter is a guide to the Unix commands and utilities that will be referenced throughout this book. This is preliminary material, and you may ...
Readline variable. The non-option argument syntax is equivalent to that found in ~/.inputrc, but must be passed as a single argument: e.g., bind '"\C-x\C-r": re-read-init-file'. Options: -m keymap Use KEYMAP as the keymap for the duration of this ...
ifconfig eth0 查看 eth0 的 IP 地址。 网卡配置完毕,如果来配置 DNS,首先要知道 DNS 配置在哪个目录 文件下,vi /etc/resolv.conf 文件: 在该文件里面添加如下两条: nameserver 202.106.0.20 nameserver 8.8.8.8 从上到下,分别表示主DNS,备DNS。配置完毕后,不需要重启网卡,DNS 立即生效。
('~' unless overridden by environment variable SIMPLE_BACKUP_SUFFIX) -T, --files-from=FILE get names to extract or create from FILE --unquote unquote filenames read with -T (default) -X, --exclude-from=FILE exclude patterns listed in FILE File name transformations: --strip-components=...
New environment variable KCONFIG_SKIP_CHECK was added that allows users to skip kernel config checksNew environment variable LTP_SINGLE_FS_TYPE was added that can be used to limit tests that run against all filesystem to a single oneThe new library testcases now print environment variables in ...
Ensure that Java 1.6 or later is in your PATH environment variable and restart InstallScape. ## solution # install java-1.8.0-openjdk sudo yum install -y java-1.8.0-openjdk 使用vcs 中出现找不到 32 位文件 ## problem gnu/stubs-32.h:No such file or directory Fatal error: gnu/stubs-32...
-z foo - Check if variable exists String Operators = - Equals == - Equals -z - Is null -n - Is not null < - Is less than in ASCII alphabetical order > - Is greater than in ASCII alphabetical order If Statements #!/bin/bash [[ if [[$foo = 'bar']]; then echo 'one' elif...