标签：port def san put extension ann epo amp ram
# awk --help Usage: awk [POSIX or GNU style options] -f progfile [--] file ... Usage: awk [POSIX or GNU style options] [--] ‘program‘ file ... POSIX options: GNU long options: (standard) -f progfile --file=progfile -F fs --field-separator=fs -v var=val --assign=var=val Short options: GNU long options: (extensions) -b --characters-as-bytes -c --traditional -C --copyright -d[file] --dump-variables[=file] -e ‘program-text‘ --source=‘program-text‘ -E file --exec=file -g --gen-pot -h --help -L [fatal] --lint[=fatal] -n --non-decimal-data -N --use-lc-numeric -O --optimize -p[file] --profile[=file] -P --posix -r --re-interval -S --sandbox -t --lint-old -V --version To report bugs, see node `Bugs‘ in `gawk.info‘, which is section `Reporting Problems and Bugs‘ in the printed version. gawk is a pattern scanning and processing language. By default it reads standard input and writes standard output. Examples: gawk ‘{ sum += $1 }; END { print sum }‘ file gawk -F: ‘{ print $1 }‘ /etc/passwd
awk -F[分隔符] ‘/搜索的字符串/{print $0}’
awk 命令不加-F选项，默认分隔符是空格
例如：搜索系统空间使用的大小：
# df -h Filesystem Size Used Avail Use% Mounted on devtmpfs 3.9G 0 3.9G 0% /dev tmpfs 3.9G 4.0K 3.9G 1% /dev/shm tmpfs 3.9G 1.2M 3.9G 1% /run tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup /dev/sda2 9.8G 6.7G 2.6G 73% / /dev/sda3 209G 353M 198G 1% /data
1、搜索系统根目录使用的空间大小
#df -h |awk ‘/sda2/{print $4}‘
2、提取系统使用空间的整数部分
#df -h |awk ‘/sda2/{print $4}‘ |awk -F[.G] ‘{print $1}‘
2
标签：port def san put extension ann epo amp ram
原文地址：https://www.cnblogs.com/carriezhangyan/p/9293622.html
