在本教程中,我们将了解如何使用 exec 命令将错误和输出日志添加到 shell 脚本。我们还将探索该命令在 shell 脚本中的其他用途。 2. 基础 每当我们在 Bash shell 中运行任何命令时,都会默认创建一个子 shell,并生成一个新的子进程来执行该命令。但是,当使用 exec 时,exec 之后的命令会替换当前的 shell。这意味...
一般的script文件(.sh)即是这种用法。这种方法先启用新的sub-shell(新的子进程),然后在其下执行命令。 另外一种方法就是上面说过的source命令,不再产生新的shell,而在当前shell下执行一切命令。 source: source命令即点(.)命令。 在bash下输入man source,找到source命令解释处,可以看到解释”Read and execute comm...
In this simple user input driven script, we executed the df command and a script using exec within different menu options. 4. File Descriptors and Logging in Shell Scripts Using the exec Command The exec command is a powerful tool for manipulating file-descriptors (FD), creating output and er...
fork是最普通的, 就是直接在脚本里面用/directory/script.sh来调用script.sh这个脚本. 运行的时候开一个sub-shell执行调用的脚本,sub-shell执行的时候, parent-shell还在。 sub-shell执行完毕后返回parent-shell. sub-shell从parent-shell继承环境变量.但是sub-shell中的环境变量不会带回parent-shell exec (exec /d...
最常⽤的是shell中出现 [sql]1. exec 3>&1 4>&2 1>> zhis_bash.log 2>&1 其含义是复制标准输出到3 错误输出到 4 把 3 4 保存在zhis_bash.log 这个⽂件中 等同于再写⼀个shell 类似 [sql]1. cat another shell 2. ./zhis_bash.sh >>zhis_bash.log 2>&1 2 其他命令 如果...
1. fork ( /directory/script.sh) :如果shell中包含执行命令,那么子命令并不影响父级的命令,在子命令执行完后再执行父级命令。子级的环境变量不会影响到父级。 fork是最普通的, 就是直接在脚本里面用/directory/script.sh来调用script.sh这个脚本.
以下是一个简单的 shell 脚本示例,展示了如何使用exec命令: 代码语言:txt 复制 #!/bin/bash echo "This is the original script." # 使用 exec 命令执行 /bin/bash,替换当前脚本进程 exec /bin/bash # 下面的代码将不会执行,因为上面的 exec 命令已经替换了当前进程 echo "This line will not be executed...
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prog.stdin=script_datalocalres,err=prog('bash')--this is roughly equivalent to running `bash < script` on the CLI Daemonizing processes I generally recommend against daemonizing processes - I think it's far better to use some kind of message queue and/or supervision system, so you can mo...
We execute several powershell scripts during OSD. Sometimes a powershell script failed with exit Code 1 (Incorrect Function). After we made a second try with the same machine it works. The Error happens rarely. In Case of 100 deployments it happens once. All deployments use the same Taskseq...