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An efficient way to transpose a file in Bash
...t coincidentally pretties-up the output a bit for this particular case.
$ cat tst.awk
BEGIN { FS=OFS="\t" }
{
for (rowNr=1;rowNr<=NF;rowNr++) {
cell[rowNr,NR] = $rowNr
}
maxRows = (NF > maxRows ? NF : maxRows)
maxCols = NR
}
END {
for (rowNr=1;rowNr<=maxRows;row...
C/C++中的段错误（Segmentation fault） - C/C++ - 清泛网 - 专注C/C++及内核技术
..., a segmentation fault occurs when a program attempts to access a memory location that it is not allowed to access, or attempts to access a memory location in a way that is not allowed (e.g., attempts to write to a read-only location, or to overwrite part of the operating system). Systems based on p...
How to pass the password to su/sudo/ssh without overriding the TTY?
... showing up in process list or log files by putting it in a file and using cat; 'cat pw | sudo -S <command>, and later rm pw.
– CAB
Mar 24 '16 at 16:43
...
Make the current commit the only (initial) commit in a Git repository?
...: remove all history (Make sure you have backup, this cannot be reverted)
cat .git/config # note <github-uri>
rm -rf .git
Step 2: reconstruct the Git repo with only the current content
git init
git add .
git commit -m "Initial commit"
Step 3: push to GitHub.
git remote add origin <g...
Bash script - variable content as a command to run
...
You just need to do:
#!/bin/bash
count=$(cat last_queries.txt | wc -l)
$(perl test.pl test2 $count)
However, if you want to call your Perl command later, and that's why you want to assign it to a variable, then:
#!/bin/bash
count=$(cat last_queries.txt | wc -l)
v...
What is the cleanest way to ssh and run multiple commands in Bash?
...NAME. Other rules about shell script quoting also apply, but are too complicated to go into here.
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廉价共享存储解决方案1-drbd+ha+nfs - 更多技术 - 清泛网 - 专注C/C++及内核技术
...结构化数据高可靠性存储的问题1、问题产生背景三台TOMCAT 服务器通过负载均衡设备对外提供WEB服务。怎么保证...在没有共享存储的情况下解决非结构化数据高可靠性存储的问题
1、问题产生背景
三台TOMCAT 服务器通过负载均...
In R, how to get an object's name after it is sent to a function?
...
Perhaps it should be: print.foo=function(x){ cat(deparse(substitute(x))) } or print.foo=function(x){ print(deparse(substitute(x)), quote=FALSE) }
– IRTFM
Nov 30 '13 at 18:58
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Is there a performance gain in using single quotes vs double quotes in ruby?
... ruby -v
ruby 1.9.3p0 (2011-10-30 revision 33570) [x86_64-darwin11.0.0]
$ cat benchmark_quotes.rb
# As of Ruby 1.9 Benchmark must be required
require 'benchmark'
n = 1000000
Benchmark.bm(15) do |x|
x.report("assign single") { n.times do; c = 'a string'; end}
x.report("assign double") { n.times...
Reverting single file in SVN to a particular revision
...
svn cat takes a revision arg too!
svn cat -r 175 mydir/myfile > mydir/myfile
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