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How do I test if a variable is a number in Bash?
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One approach is to use a regular expression, like so:
re='^[0-9]+$'
if ! [[ $yournumber =~ $re ]] ; then
echo "error: Not a number" >&2; exit 1
fi
If the value is not necessarily an integer, consider amending the regex appropriately; for instance:
^[0-9]+([.][0-9]+)?$
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Apache Spark: map vs mapPartitions?
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edited Dec 20 '15 at 22:09
Alberto Bonsanto
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ans...
Why are variables “i” and “j” used for counters?
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share
answered Nov 9 '10 at 19:54
community wiki
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Convert PHP closing tag into comment
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answered Mar 5 '13 at 9:13
ppeterkappeterka
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How to try convert a string to a Guid [duplicate]
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answered Dec 8 '08 at 19:04
leppieleppie
107k1616 gold badges181181 silver badges287287 bronze badges
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Get margin of a View
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edited Sep 19 '11 at 9:27
answered Sep 19 '11 at 8:09
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Javascript Array Concat not working. Why?
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edited Oct 9 '12 at 15:40
Rocket Hazmat
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How do I list all versions of a gem available at a remote site?
...te --all
Which returns:
*** REMOTE GEMS ***
rhc (0.84.15, 0.84.13, 0.83.9, 0.82.18, 0.81.14, 0.80.5, 0.79.5, 0.77.8, 0.75.9, 0.74.6, 0.74.5, 0.73.14, 0.72.29, 0.71.2, 0.69.6, 0.69.3, 0.68.5)
rhcp (0.2.18, 0.2.17, 0.2.16, 0.2.15, 0.2.14, 0.1.9, 0.1.8, 0.1.7, 0.1.6, 0.1.5, 0.1.4, 0.1.3, 0.1.2)
rhcp...
#include in .h or .c / .cpp?
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@user9379 That will prevent it from being included more than once per .c or .cpp file. Each .c or .cpp file is generally build individually though, which means a .h will be re-parsed for each .c or .cpp file you compile.
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莱昂氏unix源代码分析 PDF - 文档下载 - 清泛网 - 专注C/C++及内核技术
...系统定义的符号列表 7
UNIX操作系统源代码交叉引用列表 9
第一部分 初始化、进程初始化 25
第二部分 陷入、中断、系统调用和
进程管理 75
第三部分 程序交换、基本输入/输出、
块设备 109
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