2021-10-15

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我是靠谱客的博主粗心盼望，最近开发中收集的这篇文章主要介绍2021-10-15，觉得挺不错的，现在分享给大家，希望可以做个参考。

概述

grep排除“#”注释及空行

为了便于阅读，大部分linux系统软件/服务的文档自带很多注释和空行，查看时候可能会不方便，这时候可以使用grep命令看非注释行（某些软件/服务的默认值如需修改，仍然要去相应文件中修改）
grep [-v] 排除指定字符

排除以"#"开头的行
grep -v ‘#’ filename
排除以空格开头的行
grep -v ‘^$’ filename
排除以"#"和空格开头的行
grep -v ‘#’ filename | grep -v $1

[root@node2 psql]# grep -v '^$' slave/postgresql.conf |grep -v '#' $1
listen_addresses = '*'
max_wal_size = 1GB
min_wal_size = 80MB
log_timezone = 'Asia/Shanghai'
datestyle = 'iso, mdy'
timezone = 'Asia/Shanghai'
default_text_search_config = 'pg_catalog.english'
max_wal_senders = 10
wal_keep_size= 256
hot_standby = on
max_standby_streaming_delay = 30s
wal_receiver_status_interval = 10s
hot_standby_feedback = on

或者使用grep -E
grep -Ev ‘^$|#’ slave/postgresql.conf

[root@node2 psql]# grep -Ev '^$|#' slave/postgresql.conf
listen_addresses = '*'
max_wal_size = 1GB
min_wal_size = 80MB
log_timezone = 'Asia/Shanghai'
datestyle = 'iso, mdy'
timezone = 'Asia/Shanghai'
default_text_search_config = 'pg_catalog.english'
max_wal_senders = 10
wal_keep_size= 256
hot_standby = on
max_standby_streaming_delay = 30s
wal_receiver_status_interval = 10s
hot_standby_feedback = on