Linux下如何不用cat命令读取文件内容


=Start=

缘由:

在微信群里看到的一个讨论,觉得挺有启发意义的,所以在此整理一下,方便以后学习、参考。

正文:

参考解答:
head
tail
more
less
tac /etc/issue | tac

rev /etc/issue | rev
paste /etc/issue

nano
pico
vi
vim
emacs

strings
hexdump -C /etc/issue

awk
sed
[e/f/z]grep . /etc/issue

&

sort
uniq
nl
od -c /etc/issue
xxd
comm /etc/issue /etc/issue

dd count=1000 bs=1 if=/etc/issue 2>/dev/null

php -r "echo file_get_contents('/etc/issue');"
python -c "print(open('/etc/issue').read())"
perl -e 'open(DATA, "</etc/issue"); while(<DATA>) {print "$_";} close(DATA);'
ruby -e 'IO.foreach("/etc/issue"){|a| print a}'
echo $(</etc/issue)
echo `</etc/issue`

&

curl file:///etc/issue
base64 -i /etc/issue | base64 -d
xsubpp /etc/issue

/bin/c?? /etc/issue	#这个只是利用了通配符来间接调用 /bin/cat 命令
bash -v /etc/issue	#靠报错来实现,但显示不全
man /etc/issue		#显示不全
ssh -F /etc/issue	#未成功
参考链接:

=END=

, ,

《“Linux下如何不用cat命令读取文件内容”》 有 5 条评论

  1. Linux花式读取文件内容的几个命令
    https://xz.aliyun.com/t/2281
    `
    static-sh读取文件:static-sh ./flag.txt等同于/???/??????-?? ./flag.txt
    paste读取文件paste ./flag.txt /etc/passwd
    diff读取文件 diff ./flag.txt /etc/passwd
    od读取文件od -a ./flag.txt
    bzmore读取文件bzmore ./flag.txt
    bzless读取文bzless ./flag.txt
    `

  2. GTFOBins – 用来绕过本地安全限制的UNIX二进制文件的精简列表
    https://gtfobins.github.io/
    `
    ash
    awk
    bash
    csh
    curl
    dash
    ed
    emacs
    env
    expect
    find
    ftp
    gdb
    ionice
    ld.so
    less
    man
    more
    nc
    node
    perl
    php
    python2
    python3
    rpm
    rpmquery
    ruby
    scp
    setarch
    sftp
    socat
    ssh
    strace
    tar
    taskset
    tclsh
    telnet
    tftp
    vi
    watch
    wget
    wish
    zsh
    `

  3. 【整理】Linux输出内容追加时间戳
    http://www.jyguagua.com/?p=3967
    https://stackoverflow.com/questions/11731177/how-to-append-a-timestamp-to-each-line-as-it-comes-out-of-grep
    `
    # 相同的静态时间戳
    … | sed “s/^/$(date) /” >> output.txt

    # 相对时间戳
    … | gawk ‘{ print strftime(), $0 }’
    … | gawk ‘{ print strftime(“%Y-%m-%d %H:%M:%S”), $0 }’
    … | awk ‘{ print strftime(“%Y-%m-%d %H:%M:%S”), $0; fflush() }’

    # 使用 Perl
    … | perl -pe ‘s/^/localtime . ” “/e’
    … | perl -MPOSIX -pe ‘s/^/strftime(“%Y-%m-%d %H:%M:%S”, localtime) . ” “/e’
    `

  4. 如何在命令行中将文件内容中的行倒序输出?
    How can I reverse the order of lines in a file?
    https://stackoverflow.com/questions/742466/how-can-i-reverse-the-order-of-lines-in-a-file
    `
    # Using sed to emulate tac:
    sed ‘1!G;h;$!d’ ${infile}
    sed -n ‘1!G;h;$p’ ${infile}

    tail -r infile

    awk ‘{a[i++]=$0} END {for (j=i-1; j>=0;) print a[j–] }’ infile

    perl -e ‘print reverse ‘ infile
    `
    https://unix.stackexchange.com/questions/9356/how-can-i-print-lines-from-file-backwards-without-using-tac

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