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标题: [问题求助] [已解决]Linux命令截取字符串末尾的数字 [打印本页]

作者: newswan 时间: 2021-1-29 18:01 标题: [已解决]Linux命令截取字符串末尾的数字

本帖最后由 newswan 于 2021-1-29 23:27 编辑

echo aa0| sed -r -e "s/.*([0-9]+)/\1/"
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但是，如果字符串末尾没数字，结果就出错

echo aa| sed -r -e "s/.*([0-9]+)/\1/"
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请问，怎么解决

作者: netdzb 时间: 2021-1-29 19:47

回复 1# newswan

加个$试试。

作者: newswan 时间: 2021-1-29 22:04

解决

grep -Eo "[0-9]+$"
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作者: Batcher 时间: 2021-1-29 22:55

回复 1# newswan

echo aa0|sed -r "/[0-9]$/!d;s/.*([0-9]+)/\1/"
echo aa|sed -r "/[0-9]$/!d;s/.*([0-9]+)/\1/"
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作者: qixiaobin0715 时间: 2021-1-30 07:34

本帖最后由 qixiaobin0715 于 2021-1-30 07:38 编辑

回复 1# newswan
sed没用过，正则倒是接触过，说的不一定对：将.*[0-9]+改为[0-9]*试试
echo aa| sed -r -e "s/[0-9]*//"

作者: qixiaobin0715 时间: 2021-1-30 07:36

e是表示end吗

作者: newswan 时间: 2021-1-30 10:40

Usage: sed [OPTION]... {script-only-if-no-other-script} [input-file]...

  -n, --quiet, --silent
               suppress automatic printing of pattern space
   --debug
               annotate program execution
  -e script, --expression=script
               add the script to the commands to be executed
  -f script-file, --file=script-file
               add the contents of script-file to the commands to be executed
  --follow-symlinks
               follow symlinks when processing in place
  -i[SUFFIX], --in-place[=SUFFIX]
               edit files in place (makes backup if SUFFIX supplied)
  -b, --binary
               open files in binary mode (CR+LFs are not processed specially)
  -l N, --line-length=N
               specify the desired line-wrap length for the `l' command
  --posix
               disable all GNU extensions.
  -E, -r, --regexp-extended
               use extended regular expressions in the script
               (for portability use POSIX -E).
  -s, --separate
               consider files as separate rather than as a single,
               continuous long stream.
   --sandbox
               operate in sandbox mode (disable e/r/w commands).
  -u, --unbuffered
               load minimal amounts of data from the input files and flush
               the output buffers more often
  -z, --null-data
               separate lines by NUL characters
   --help    display this help and exit
   --version  output version information and exit

If no -e, --expression, -f, or --file option is given, then the first
non-option argument is taken as the sed script to interpret.  All
remaining arguments are names of input files; if no input files are
specified, then the standard input is read.

GNU sed home page: <https://www.gnu.org/software/sed/>.
General help using GNU software: <https://www.gnu.org/gethelp/>.

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