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; E8 I1 o! M+ F( n- r# GLinux fold命令用于限制文件列宽。
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fold指令会从指定的文件里读取内容，将超过限定列宽的列加入增列字符后，输出到标准输出设备。若不指定任何文件名称，或是所给予的文件名为"-"，则fold指令会从标准输入设备读取数据。
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语法
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& Y6 N# N: \+ w- qfold [-bs][-w<每列行数>][--help][--version][文件...]
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, k. t% p$ d! h3 v参数：( O8 G3 |' w* t- U% `" L
: ]9 Q' G, n* g) @4 m* X, E o8 |-b或--bytes 以Byte为单位计算列宽，而非采用行数编号为单位。; d; S9 _8 ~! m# f& n, Q
-s或--spaces 以空格字符作为换列点。4 }3 P* t- l% {! u5 P6 h1 E; }
-w<每列行数>或--width<每列行数> 设置每列的最大行数。% j- o" D( B- P% W- f+ ~+ q9 n1 R
--help 在线帮助。8 ^ E. H* s! B- [+ B
--version 显示版本信息。3 N/ b& b) R. w$ e; |0 ?
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实例
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; a3 k) F3 R4 h4 E将一个名为testfile 的文件的行折叠成宽度为30，可使用如下命令：! \0 F( D+ g$ ^1 f7 z
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fold -w 30 testfile
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为了对比，先将testfile文件输出如下：
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N" m- t/ |0 d4 |9 I$ f$ cat testfile #查看testfile 中的内容
* }- N: }% G2 u5 \ `/ H1 [9 ^Linux networks are becoming more and more common, but
' e. X) z4 d. [, e9 Z; k6 _ Lsecurity is often an overlooked % ?" s; m6 E9 S' X, Z5 P
issue. Unfortunately, in today’s environment all networks
! O9 w+ b9 O. B& x- Bare potential hacker targets, / }! Q8 S6 }" K) B, l8 n) N
from top-secret military research networks to small home LANs.
: i3 s$ L D9 o2 ]5 q, C1 rLinux Network Security focuses on securing Linux in a ; j( u3 {7 Y: m: m
networked environment, where the / H5 L+ p3 e' N) ]
security of the entire network needs to be considered
5 x! X( U/ k1 C0 m* y9 krather than just isolated machines. 8 q0 r3 X) K/ g- K
It uses a mix of theory and practical techniques to
9 A- ]3 V! [7 ~5 q, A. k" bteach administrators how to install and
" o# V9 g# d- I2 p* F/ e% [use security applications, as well as how the + q* C) e* ^# V) C
applications work and why they are necessary. / o3 Q- R1 X' X
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然后使用fold命令折叠显示：3 L6 A+ X; w. Q1 a( q* y9 m! S2 R2 h
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$ fold -w 30 testfile #行折叠成宽度为30，显示testfile 文件
4 B) |- h# U) f" ?" Q, BLinux networks are becoming mo
7 r/ E" f8 U& d3 Rre and more common, but securi - W9 B, H9 S" a4 V
ty is often an overlooked issu ; F1 m. z% m. P: r4 |
e. Unfortunately, in today’s ' u- I: L g$ n7 _5 r. n7 p2 v
environment all networks are
! g i) u/ l. p' Q0 C" Q/ ^potential hacker targets, from
2 T6 J3 m' Z3 i2 P! q' Ktop-secret military research
0 L% g/ Q' T" H$ v; T; e) }# Anetworks to small home LANs. : A D0 _, e7 g& k; ~
Linux Network Security focuses
" f% N0 A4 D8 T# Y% Ion securing Linux in a networ
5 S0 [* |- i2 c9 ~ked environment, where the sec 8 T: C; `6 d3 a: y! _
urity of the entire network ne
& _, _/ e, M! C( r: Oeds to be considered rather th 8 K6 e( X, H% @) S' k% G
an just isolated machines. It 3 S0 N. g" B1 C0 n# H2 X
uses a mix of theory and pract : x* O( j0 C1 S' ?$ i7 O# u* V& J
ical techniques to teach admin
# M; T8 V& d' y l& P `; P- b6 o2 ^istrators how to install and u + `" K9 c/ w& ^% `7 G5 g, M/ x
se security applications, as w
0 |- |6 A- q' `- H0 t$ J( Q0 Hell as how the applications wo ) [5 S' b+ |" T5 {
rk and why they are necessary
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发表于 2021-9-23 09:55
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