linux-在/ etc / environment中添加或更新配置记录

2019-12-09 23:52:38 阅读：825 来源： 互联网

标签：configuration scripting integration system-administration linux

我的/ etc / environment看起来像这样：

cat /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"

我希望使用一个命令(sed,awk,python等),使其看起来像这样：

cat /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
JAVA_HOME="/usr/lib/jvm/java-6-sun"

现在的问题是,我宁愿它是1衬板(在sed -XYZ / DoMagic / / etc / environment的字段中),它需要包含合并逻辑,即-追加新的配置记录或更新现有的.最重要的是,它应该防止文件看起来像这样：(由经验丰富的Shell脚本编写者在每次调用时调用echo>>引起)

cat /etc/environment
PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games"
JAVA_HOME="/usr/lib/jvm/java-5-sun"
JAVA_HOME="/usr/lib/jvm/java-6-sun"
JAVA_HOME="/usr/lib/jvm/java-6-sun"
JAVA_HOME="/usr/lib/jvm/java-6-sun"

我想这是一个技巧性的问题,因为我想避免使用自定义脚本,例如

/usr/local/bin/PropUpdate /etc/environment JAVA_HOME "/usr/lib/jvm/java-6-sun"

/usr/local/bin / PropUpdate是以下脚本(为了示例而编写,可能包含错误.不胜感激)

#!/bin/bash

# Append/Update a configuration record in a file
#
# Usage example:
# /usr/local/bin/PropUpdate /etc/environment JAVA_HOME "/usr/lib/jvm/java-6-sun"
#
# Author Maxim Veksler <maxim@vekslers.org>
# Version 0.5-2010-07-27


EXPECTED_ARGS=3
E_BADARGS=3
E_BADFILE=4

if [[ $# -ne ${EXPECTED_ARGS} ]]; then
  echo "Usage: `basename $0` /path/to/config.conf ParameterName newValueText" >&2
  exit $E_BADARGS
fi

CONFIGURATION_FILE="$1"
CONFIGURATION_PARAMETER="$2"
CONFIGURATION_VALUE="$3"

if [[ ! -e "${CONFIGURATION_FILE}" ]]; then
        echo "Configuration file ${CONFIGURATION_FILE} does not exist" >&2
        exit $E_BADFILE
fi

if [[ ! -w "${CONFIGURATION_FILE}" ]]; then
        echo "Can't modify ${CONFIGURATION_FILE}" >&2
        exit $E_BADFILE
fi



#########################################
## Decide what parameter we are adding ##
#########################################
__param_found=0

# First check CONFIGURATION_PARAMETER supplied by use that contains "="
if [[ ${CONFIGURATION_PARAMETER} == *=* ]]; then
        # It should exist in the file, plain
        if grep -qE "^${CONFIGURATION_PARAMETER}" "${CONFIGURATION_FILE}"; then
                __param_found=1
                SUFFIX_REGEX='[[:space:]]*'
        fi
else
        # OK, sophisticated user, did not send "=" with the parameter...
        if grep -qE "^${CONFIGURATION_PARAMETER}[[:space:]]*=" "${CONFIGURATION_FILE}"; then
                # Let's check if such configuration with Parameter + "=" exists
                __param_found=1
                SUFFIX_REGEX='[[:space:]]*=[[:space:]]*'
        elif grep -qE "^${CONFIGURATION_PARAMETER}[[:space:]]+" "${CONFIGURATION_FILE}"; then
                # If such parameter exists, at all
                __param_found=1
                SUFFIX_REGEX='[[:space:]]\+'
        fi
fi


if [[ $__param_found == 1 ]]; then
        #echo sed -i "s|^\(${CONFIGURATION_PARAMETER}${SUFFIX_REGEX}\).*$|\1${CONFIGURATION_VALUE}|g" "${CONFIGURATION_FILE}"
        sed -i "s|^\(${CONFIGURATION_PARAMETER}${SUFFIX_REGEX}\).*$|\1${CONFIGURATION_VALUE}|g" "${CONFIGURATION_FILE}"

else
        if [[ ${CONFIGURATION_PARAMETER} == *=* ]]; then
                # Configuration parameter contains "=" in it's name, good just append
                echo "${CONFIGURATION_PARAMETER}${CONFIGURATION_VALUE}" >> "${CONFIGURATION_FILE}"
        else
                # Try to guess if this file is a "param = value" or "param value" type of file.
                if grep -qE "^[[:alnum:]]+[[:space:]]*=" "${CONFIGURATION_FILE}"; then
                        # Seems like a "param = value" type of file
                        echo "${CONFIGURATION_PARAMETER}=${CONFIGURATION_VALUE}" >> "${CONFIGURATION_FILE}"
                else
                        # Seems like a "param  value" type of file
                        echo "${CONFIGURATION_PARAMETER} ${CONFIGURATION_VALUE}" >> "${CONFIGURATION_FILE}"
                fi
        fi
fi

#cat $CONFIGURATION_FILE

谢谢,
格言.

-更新：我实际上有点喜欢这个脚本,所以我对其进行了一些改进.现在看来已经可以生产了.请享用.

解决方法:

如我在my answer to a relevant question中所述,您可以尝试在/etc/profile.d/中使用您自己的名称创建文件,而不必尝试解析/ etc / environment文件,而是可以在安装过程中将其复制过来,因为它只包含您的内容.更不用说它会使您的脚本更短.

标签：configuration,scripting,integration,system-administration,linux
来源： https://codeday.me/bug/20191209/2097618.html

本站声明： 1. iCode9 技术分享网（下文简称本站）提供的所有内容，仅供技术学习、探讨和分享；
2. 关于本站的所有留言、评论、转载及引用，纯属内容发起人的个人观点，与本站观点和立场无关；
3. 关于本站的所有言论和文字，纯属内容发起人的个人观点，与本站观点和立场无关；
4. 本站文章均是网友提供，不完全保证技术分享内容的完整性、准确性、时效性、风险性和版权归属；如您发现该文章侵犯了您的权益，可联系我们第一时间进行删除；
5. 本站为非盈利性的个人网站，所有内容不会用来进行牟利，也不会利用任何形式的广告来间接获益，纯粹是为了广大技术爱好者提供技术内容和技术思想的分享性交流网站。

ICode9

linux-在/ etc / environment中添加或更新配置记录