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ychaouche's questions

Martin Hope
ychaouche
Asked: 2024-11-15 01:56:59 +0800 CST
  • 6

我正在尝试通过将文件名称粘贴到 while 循环中来从目录中删除文件，该循环将简单地从给定的文件列表中删除每个项目。

$ sponge | while read file; do echo "rm $file"; rm "$file"; done;
background.bundle.js
964.bundle.js
background.bundle.js.LICENSE.txt
...
META-INF/manifest.mf
META-INF/mozilla.sf
META-INF/mozilla.rsa
^D
rm background.bundle.js
rm: remove regular file ‘background.bundle.js’? $
$

（注意最后的 ^D）

如图所示，在发出 ^D（文件结束符）后，sponge 命令将整个输出发送到 while 循环，并为每个文件分别调用 rm。然而，实际发生的情况是，它只为 background.bundle.js 调用一次，要求确认，而我却没有机会输入任何内容，循环就提前退出了。这导致提示符 ($) 后面没有必要的换行符，表明循环突然结束。

我希望在不使用临时文件的情况下修复此问题。我想使用 exec 管理文件输入，以便循环从不同的输入流读取，让标准输入可供 rm 读取用户的确认。为此，我如何将 sponge 输出和读取输入重定向到特定的文件描述符？

bash
Martin Hope
ychaouche
Asked: 2023-02-26 18:19:27 +0800 CST
  • 8

我正在尝试99.11111按.099.11AWK

我尝试了以下变体但没有成功。

$ awk '{printf ("%000.2f\n", $1);}' <<< 99.111111
99.11
$ awk '{printf ("%3.2f\n", $1);}' <<< 99.111111
99.11
$ awk '{printf ("%03.2f\n", $1);}' <<< 99.111111
99.11
awk
Martin Hope
ychaouche
Asked: 2022-05-27 04:09:32 +0800 CST
  • 0

源文件 ：~/SCRIPTS/script

目标目录：~/TMP/LAB

命令应该是这样的：<command> <option> ~/SCRIPTS/script ~/TMP/LAB

命令后的期望结果：~/TMP/LAB/SCRIPTS/script

做没有意义

<command> <option> ~/SCRIPTS/script  ~/TMP/LAB/SCRIPTS/

因为每次更改源文件时都必须编辑命令。基本上我希望命令根据它在源中找到的结构创建目录，而不是基于我想要创建的目标。

该命令应：

  1. 创建 ~/TMP/LAB/SCRIPTS/
  2. 复制 ~/SCRIPTS/script 到它。

cp --parents这样做，但仅在复制目录时

不知道install能不能帮到我？或者也许rsync？

files rsync
Martin Hope
ychaouche
Asked: 2018-03-16 00:36:26 +0800 CST
  • 10

为什么没有我对系统进行任何更新，特定man页面（在我的情况下，对于nc命令）会有今天的日期？另外，为什么“无人值守更新”日志没有显示当天的任何特定活动？

2018-03-14 07:47:38,124 INFO Initial blacklisted packages:
2018-03-14 07:47:38,135 INFO Starting unattended upgrades script
2018-03-14 07:47:38,135 INFO Allowed origins are: ['o=LinuxMint,a=qiana-security', 'o=LinuxMintESM,a=qiana']
2018-03-14 07:47:51,767 INFO No packages found that can be upgraded unattended and no pending auto-removals

这是nc手册页的页脚：

BSD                             March 14, 2018                             BSD

那是在 Linux Mint 17 (qiana) 上，基于 Ubuntu 14.04 (trusty)，带有 groff 1.22.2 和 man-db 2.6.7.1。

编辑

请求的命令输出：

  1. man -aw nc 

    /usr/share/man/man1/nc_openbsd.1.gz

  2. ls -ld $(man -aw nc) 

    -rw-r--r-- 1 root root 5.7K Dec  4  2012 /usr/share/man/man1/nc_openbsd.1.gz

这很奇怪……

  1. dpkg -S $(man -aw nc)?

    netcat-openbsd: /usr/share/man/man1/nc_openbsd.1.gz

  2. type -a man

    man is /usr/bin/man

  3. zgrep docdate $(man -aw nc)

    .Dd $Mdocdate: February 7 2012 $

  4. 添加页脚 strace -f man nc 2>&1 | grep -e '^BSD' -e '"/.*nc'

    ychaouche#ychaouche-PC 14:31:15 ~ $ strace -f man nc 2>&1 | grep -e '^BSD' -e '"/.*nc'
execve("/usr/bin/man", ["man", "nc"], [/* 87 vars */]) = 0
lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
readlink("/usr/share/man/man1/nc.1.gz", "/etc/alternatives/nc.1.gz", 4095) = 25
lstat("/etc/alternatives/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=35, ...}) = 0
readlink("/etc/alternatives/nc.1.gz", "/usr/share/man/man1/nc_openbsd.1"..., 4095) = 35
lstat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
open("/usr/share/man/man1/nc_openbsd.1.gz", O_RDONLY) = 3
access("/usr/share/man/man1/nc.1.gz", R_OK) = 0
lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
lstat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=25, ...}) = 0
readlink("/usr/share/man/man1/nc.1.gz", "/etc/alternatives/nc.1.gz", 4095) = 25
lstat("/etc/alternatives/nc.1.gz", {st_mode=S_IFLNK|0777, st_size=35, ...}) = 0
readlink("/etc/alternatives/nc.1.gz", "/usr/share/man/man1/nc_openbsd.1"..., 4095) = 35
lstat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
open("/usr/share/man/man1/nc_openbsd.1.gz", O_RDONLY) = 3
stat("/usr/share/man/man1/nc.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
stat("/usr/share/man/cat1/nc.1.gz", 0x7fffa49c0940) = -1 ENOENT (No such file or directory)
stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
open("/usr/share/man/man1/nc_openbsd.1.gz", O_RDONLY) = 3
[pid  3878] stat("/usr/share/man/man1/nc_openbsd.1.gz", {st_mode=S_IFREG|0644, st_size=5756, ...}) = 0
[pid  3878] access("/usr/share/man/man1/nc_openbsd.1.gz", R_OK <unfinished ...>
BSD                             March 20, 2018                             BSD

  5. strace -f man nc 2>&1 | grep -vwe -1 | grep -o '"/[^"]*"' | sort -u | grep -v /dev/ | xargs sh -c 'zgrep "March 14" "$@"' sh 2> /dev/null

     no output

    似乎日期没有硬编码。可能是生成今天日期的宏。

  6. env | grep -e ROFF -e MAN -e GRO

    SESSION_MANAGER=local/ychaouche-PC:@/tmp/.ICE-unix/2915,unix/ychaouche-PC:/tmp/.ICE-unix/2915
MANDATORY_PATH=/usr/share/gconf/default.mandatory.path

  7. env -i man nc显示今天的日期（2018 年 3 月 20 日）

  8. zcat /usr/share/man/man1/nc_openbsd.1.gz | nroff -mandoc | grep BSD

    ychaouche#ychaouche-PC 06:59:53 ~ $ zcat /usr/share/man/man1/nc_openbsd.1.gz | nroff -mandoc | grep BSD
NC(1)                     BSD General Commands Manual                    NC(1)
BSD                             March 20, 2018                             BSD
ychaouche#ychaouche-PC 07:01:41 ~ $

  9. strace -f man nc 2>&1 | grep -vwe -1 | grep -o '"/[^"]*tmac/[^"]*"' | sort -u | xargs ls -lrtd

    ychaouche#ychaouche-PC 17:26:08 /usr/share/man/man1 $ unalias ls
ychaouche#ychaouche-PC 17:26:12 /usr/share/man/man1 $ unalias xargs
ychaouche#ychaouche-PC 17:26:14 /usr/share/man/man1 $ unalias grep
ychaouche#ychaouche-PC 17:26:16 /usr/share/man/man1 $ strace -f man nc 2>&1 | grep -vwe -1 | grep -o '"/[^"]*tmac/[^"]*"' | sort -u | xargs ls -lrtd
-rw-r--r-- 1 root root  4065 Jan 22  2014 /usr/share/groff/1.22.2/tmac/papersize.tmac
-rw-r--r-- 1 root root  1860 Jan 22  2014 /usr/share/groff/1.22.2/tmac/andoc.tmac
-rw-r--r-- 1 root root    71 Jan 22  2014 /usr/share/groff/1.22.2/tmac/unicode.tmac
-rw-r--r-- 1 root root  1552 Jan 22  2014 /usr/share/groff/1.22.2/tmac/tty.tmac
-rw-r--r-- 1 root root  5183 Jan 22  2014 /usr/share/groff/1.22.2/tmac/tty-char.tmac
-rw-r--r-- 1 root root  1145 Jan 22  2014 /usr/share/groff/1.22.2/tmac/troffrc-end
-rw-r--r-- 1 root root  1387 Jan 22  2014 /usr/share/groff/1.22.2/tmac/troffrc
-rw-r--r-- 1 root root  4729 Jan 22  2014 /usr/share/groff/1.22.2/tmac/pspic.tmac
-rw-r--r-- 1 root root 22042 Jan 22  2014 /usr/share/groff/1.22.2/tmac/mdoc/doc-syms
-rw-r--r-- 1 root root  4048 Jan 22  2014 /usr/share/groff/1.22.2/tmac/mdoc/doc-nroff
-rw-r--r-- 1 root root 29284 Jan 22  2014 /usr/share/groff/1.22.2/tmac/mdoc/doc-common
-rw-r--r-- 1 root root  2250 Jan 22  2014 /usr/share/groff/1.22.2/tmac/latin1.tmac
-rw-r--r-- 1 root root 27860 Jan 22  2014 /usr/share/groff/1.22.2/tmac/hyphen.us
-rw-r--r-- 1 root root 15678 Jan 22  2014 /usr/share/groff/1.22.2/tmac/hyphenex.us
-rw-r--r-- 1 root root  1362 Jan 22  2014 /usr/share/groff/1.22.2/tmac/fallbacks.tmac
-rw-r--r-- 1 root root 73807 Jan 22  2014 /usr/share/groff/1.22.2/tmac/doc.tmac
-rw-r--r-- 1 root root   537 Jan 22  2014 /usr/share/groff/1.22.2/tmac/composite.tmac
-rw-r--r-- 1 root root   704 Jan 22  2014 /usr/share/groff/site-tmac/mdoc.local
ychaouche#ychaouche-PC 17:26:18 /usr/share/man/man1 $
unattended-upgrades