In addition to Weibo, there is also WeChat
Please pay attention
WeChat public account
Shulou
2025-09-23 Update From: SLTechnology News&Howtos shulou NAV: SLTechnology News&Howtos > Servers >
Share
Shulou(Shulou.com)06/02 Report--
1. Put it on / bin
2. Different characters and wildcards
? One character
* 0 or more characters (except for. The beginning of the file, ". *" this can show the hidden file)
$tail
^ head
[list] can match any character in list
[! list] does not match list
Ls ne?
Ls? e?
Ls n *
Rm *. * Delete a file containing at least one period
Rm * Delete all files
Rm report * Delete report, and then delete all files
3. Standard document
1) the place where the standard input stdin process gets input, usually the keyboard
2) the place where the standard output stdout process places the output, usually the screen
3) Standard error output stderr
4. File pointer
Every file has these three standards.
File pointer redirects symbol file
0
< stdin 1 >Stdout
2 2 > stderr
Command
< file command >File will overwrite
Command > > file append
/ dev/null black hole
Command
< infile >Outfile 2 > errfile
Command > > appendfile 2 > > errfile
< infile command >Outfile 2 > & 1
Pointer 1 first points to outfile,2 > error output to the position of pointer 1, that is, outfile
Command 2 > & 1 > outfile
Pointer 1 hasn't changed yet, so type it to the screen first.
Ls-l / * / * > list.file 2 > & 1
0 (unchanged) STDIN
1 (changed). / list.file
2 (changed). / list.file
Ls-l / * / * 2 > & 1 > list.file
0 (unchanged) STDIN
1 (changed). / list.file
2 (changed) STDOUT
Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.
Views: 0
*The comments in the above article only represent the author's personal views and do not represent the views and positions of this website. If you have more insights, please feel free to contribute and share.
The market share of Chrome browser on the desktop has exceeded 70%, and users are complaining about
The world's first 2nm mobile chip: Samsung Exynos 2600 is ready for mass production.According to a r
A US federal judge has ruled that Google can keep its Chrome browser, but it will be prohibited from
Continue with the installation of the previous hadoop.First, install zookooper1. Decompress zookoope
About us Contact us Product review car news thenatureplanet
More Form oMedia: AutoTimes. Bestcoffee. SL News. Jarebook. Coffee Hunters. Sundaily. Modezone. NNB. Coffee. Game News. FrontStreet. GGAMEN
© 2024 shulou.com SLNews company. All rights reserved.