在Ubuntu18.04系统中，安装tldr

在Ubuntu18.04系统中，tldr的完整安装流程总结：

mkdir -p ~/.tldr/tldr
sudo git clone https://codechina.csdn.net/mirrors/tldr-pages/tldr.git ~/.tldr/tldr
sudo apt-get update
sudo apt-get install tldr

shunren@shunren-VPCCA16EC:~/test/c++/phread$ sudo apt-get update
Hit:1 http://dl.google.com/linux/chrome/deb stable InRelease
Get:2 http://security.ubuntu.com/ubuntu bionic-security InRelease [88.7 kB]
Hit:3 http://ppa.launchpad.net/apt-fast/stable/ubuntu bionic InRelease
Hit:4 http://cn.archive.ubuntu.com/ubuntu bionic InRelease
Ign:5 http://archive.canonical.com lucid InRelease
Err:6 http://archive.canonical.com lucid Release                     404  Not Found [IP: 91.189.88.141 80]
Ign:7 http://ppa.launchpad.net/hzwhuang/ss-qt5/ubuntu bionic InRelease
Get:8 http://cn.archive.ubuntu.com/ubuntu bionic-updates InRelease [88.7 kB]
Hit:9 http://ppa.launchpad.net/notepadqq-team/notepadqq/ubuntu bionic InRelease
Ign:10 http://ppa.launchpad.net/saiarcot895/myppa/ubuntu bionic InRelease
Hit:11 http://ppa.launchpad.net/yktooo/ppa/ubuntu bionic InRelease
Hit:12 http://packages.microsoft.com/repos/code stable InRelease
Get:13 http://cn.archive.ubuntu.com/ubuntu bionic-backports InRelease [74.6 kB]
Err:14 http://ppa.launchpad.net/hzwhuang/ss-qt5/ubuntu bionic Release404  Not Found [IP: 91.189.95.85 80]
Err:15 http://ppa.launchpad.net/saiarcot895/myppa/ubuntu bionic Release404  Not Found [IP: 91.189.95.85 80]
Get:16 http://security.ubuntu.com/ubuntu bionic-security/main amd64 DEP-11 Metadata [55.0 kB]
Get:17 http://cn.archive.ubuntu.com/ubuntu bionic-updates/main i386 Packages [1434 kB]
Get:18 http://security.ubuntu.com/ubuntu bionic-security/universe amd64 DEP-11 Metadata [59.5 kB]
Get:19 http://cn.archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages [2464 kB]
Get:20 http://cn.archive.ubuntu.com/ubuntu bionic-updates/main amd64 DEP-11 Metadata [296 kB]
Get:21 http://cn.archive.ubuntu.com/ubuntu bionic-updates/universe amd64 DEP-11 Metadata [300 kB]
Get:22 http://cn.archive.ubuntu.com/ubuntu bionic-backports/universe amd64 DEP-11 Metadata [9268 B]
Reading package lists... Done
E: The repository 'http://archive.canonical.com lucid Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/hzwhuang/ss-qt5/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://ppa.launchpad.net/saiarcot895/myppa/ubuntu bionic Release' does not have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
shunren@shunren-VPCCA16EC:~/test/c++/phread$ sudo apt-get install tldrReading package lists... Done
Building dependency tree
Reading state information... Done
The following NEW packages will be installed:tldr
0 upgraded, 1 newly installed, 0 to remove and 26 not upgraded.
Need to get 860 kB of archives.
After this operation, 4880 kB of additional disk space will be used.
Get:1 http://cn.archive.ubuntu.com/ubuntu bionic/universe amd64 tldr amd64 0.2.3-3 [860 kB]
Fetched 860 kB in 9s (95.7 kB/s)
Selecting previously unselected package tldr.
(Reading database ... 281894 files and directories currently installed.)
Preparing to unpack .../tldr_0.2.3-3_amd64.deb ...
Unpacking tldr (0.2.3-3) ...
Setting up tldr (0.2.3-3) ...
update-alternatives: using /usr/bin/tldr-hs to provide /usr/bin/tldr (tldr) in auto mode
Processing triggers for man-db (2.8.3-2ubuntu0.1) ...
shunren@shunren-VPCCA16EC:~/test/c++/phread$ tldr
tldr - Simplified and community-driven man pagesUsage: tldr [-v|--version] [--update] COMMANDtldr Client programAvailable options:-h,--help                Show this help text-v,--version             Show version--update                 Update tldr pagesCOMMAND                  name of the command
shunren@shunren-VPCCA16EC:~/test/c++/phread$ tldr sort
sort
Sort lines of text files.
More information:
https://www.gnu.org/software/coreutils/sort
.- Sort a file in ascending order:sort {{path/to/file}}- Sort a file in descending order:sort --reverse {{path/to/file}}- Sort a file in case-insensitive way:sort --ignore-case {{path/to/file}}- Sort a file using numeric rather than alphabetic order:sort --numeric-sort {{path/to/file}}- Sort /etc/passwdby the 3rd field of each line numerically, using ":" as a field separator:sort --field-separator={{:}} --key={{3n}} {{/etc/passwd}}- Sort a file preserving only unique lines:sort --unique {{path/to/file}}- Sort a file, printing the output to the specified output file (can be used to sort a file in-place):sort --output={{path/to/file}} {{path/to/file}}- Sort numbers with exponents:sort --general-numeric-sort {{path/to/file}}

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