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BASH_ENV 在 AWS Ubuntu 20.04 crontab 中被忽略

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BASH_ENV 在 AWS Ubuntu 20.04 crontab 中被忽略

既

SHELL=/bin/bash
BASH_ENV=/home/ubuntu/.bashrc

在 AWS Ubuntu 20.04.1 LTS crontab 上设置，.bashrc未获取来源。我遇到了这个错误/bin/bash: python: command not found。python仅在其命令在 中可用的环境中可用.bashrc。在我的 cronjob 中，我激活环境，然后调用python. （当我调试时，我意识到环境也没有被激活，这证实了没有被读取的事实.bashrc。）

我已经确保ps -p $$它SHELL=/bin/bash实际上正在运行，bash而不是应该运行sh（鉴于这BASH_ENV在 中无效sh）。我还确保通过在其中一个 cronjobs 中BASH_ENV运行来正确设置该变量。echo $BASH_ENV只是没有来源而已。

我已经在另一台非 AWS 机器的 crontab 中运行了这些完全相同的 cronjobs，并且运行良好。我已经回顾了许多相关问题（1,2,3,4），但我所做的一切似乎都符合预期。

我在 AWS 机器上尝试的另一件事是颠倒 和 的顺序SHELL，但BASH_ENV没有结果：

BASH_ENV=/home/ubuntu/.bashrc
SHELL=/bin/bash

我知道我可以.bashrc在每个 cronjob 之前获取资源。我宁愿设置一次，以避免将来由于单独的 cronjob 编辑而出现错误，而且因为如果我也必须在另一台机器上进行设置，我宁愿编辑一行而不是将来的许多 cronjobs。同时，我也尝试在前面添加source ~/.bashrc, source /home/ubuntu/.bashrc, . ~/.bashrc，但. /home/ubuntu/.bashrc没有达到预期的效果。

答案1

发现 AWS~/.bashrc文件在开头有以下代码，~/.bashrc如果 shell 不是交互式的（并且 cronjobs 使用非交互式 shell），则该代码不会运行脚本的其余部分：

# If not running interactively, don't do anything
case $- in
   *i*) ;;
     *) return;;
esac

~/.bashrc在使用之前应该阅读整个现有的 AWS文件。正如比利叔叔在评论中提到的，一些发行版有这个

为了避免在.bashrc执行 bash 以通过 ssh 运行非交互式命令时加载所有交互式内容（完成、函数、别名）。

鉴于我以前的经验，它采用了仅附加命令来造成混乱的通常（也许不是最佳）做法~/.bashrc。

我不清楚文件的其余部分是否可能对非交互式 shell 产生不利影响，但我认为这不会增加太多开销。这是~/.bashrc文件的原始内容：

# ~/.bashrc: executed by bash(1) for non-login shells.
# see /usr/share/doc/bash/examples/startup-files (in the package bash-doc)
# for examples

# If not running interactively, don't do anything
case $- in
    *i*) ;;
      *) return;;
esac

# don't put duplicate lines or lines starting with space in the history.
# See bash(1) for more options
HISTCONTROL=ignoreboth

# append to the history file, don't overwrite it
shopt -s histappend

# for setting history length see HISTSIZE and HISTFILESIZE in bash(1)
HISTSIZE=1000
HISTFILESIZE=2000

# check the window size after each command and, if necessary,
# update the values of LINES and COLUMNS.
shopt -s checkwinsize

# If set, the pattern "**" used in a pathname expansion context will
# match all files and zero or more directories and subdirectories.
#shopt -s globstar

# make less more friendly for non-text input files, see lesspipe(1)
[ -x /usr/bin/lesspipe ] && eval "$(SHELL=/bin/sh lesspipe)"

# set variable identifying the chroot you work in (used in the prompt below)
if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
    debian_chroot=$(cat /etc/debian_chroot)
fi

# set a fancy prompt (non-color, unless we know we "want" color)
case "$TERM" in
    xterm-color|*-256color) color_prompt=yes;;
esac

# uncomment for a colored prompt, if the terminal has the capability; turned
# off by default to not distract the user: the focus in a terminal window
# should be on the output of commands, not on the prompt
#force_color_prompt=yes

if [ -n "$force_color_prompt" ]; then
    if [ -x /usr/bin/tput ] && tput setaf 1 >&/dev/null; then
    # We have color support; assume it's compliant with Ecma-48
    # (ISO/IEC-6429). (Lack of such support is extremely rare, and such
    # a case would tend to support setf rather than setaf.)
    color_prompt=yes
    else
    color_prompt=
    fi
fi

if [ "$color_prompt" = yes ]; then
    PS1='${debian_chroot:+($debian_chroot)}\[\033[01;32m\]\u@\h\[\033[00m\]:\[\033[01;34m\]\w\[\033[00m\]\$ '
else
    PS1='${debian_chroot:+($debian_chroot)}\u@\h:\w\$ '
fi
unset color_prompt force_color_prompt

# If this is an xterm set the title to user@host:dir
case "$TERM" in
xterm*|rxvt*)
    PS1="\[\e]0;${debian_chroot:+($debian_chroot)}\u@\h: \w\a\]$PS1"
    ;;
*)
    ;;
esac

# enable color support of ls and also add handy aliases
if [ -x /usr/bin/dircolors ]; then
    test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"
    alias ls='ls --color=auto'
    #alias dir='dir --color=auto'
    #alias vdir='vdir --color=auto'

    alias grep='grep --color=auto'
    alias fgrep='fgrep --color=auto'
    alias egrep='egrep --color=auto'
fi

# colored GCC warnings and errors
#export GCC_COLORS='error=01;31:warning=01;35:note=01;36:caret=01;32:locus=01:quote=01'

# some more ls aliases
alias ll='ls -alF'
alias la='ls -A'
alias l='ls -CF'

# Add an "alert" alias for long running commands.  Use like so:
#   sleep 10; alert
alias alert='notify-send --urgency=low -i "$([ $? = 0 ] && echo terminal || echo error)" "$(history|tail -n1|sed -e '\''s/^\s*[0-9]\+\s*//;s/[;&|]\s*alert$//'\'')"'

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

# enable programmable completion features (you don't need to enable
# this, if it's already enabled in /etc/bash.bashrc and /etc/profile
# sources /etc/bash.bashrc).
if ! shopt -oq posix; then
  if [ -f /usr/share/bash-completion/bash_completion ]; then
    . /usr/share/bash-completion/bash_completion
  elif [ -f /etc/bash_completion ]; then
    . /etc/bash_completion
  fi
fi

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