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How can I check if a directory exists in a Bash shell script?
...INK"
if [ -d "$SYMLINK" ]; then
rmdir "$SYMLINK"
fi
Will produce the error message:
rmdir: failed to remove `symlink': Not a directory
So symbolic links may have to be treated differently, if subsequent commands expect directories:
if [ -d "$LINK_OR_DIR" ]; then
if [ -L "$LINK_OR_DIR" ]...
SQL - HAVING vs. WHERE
...the [country] filtering to the WHERE has you've suggested, the query would error from SELECT [country], as [country] is no longer included in the GROUP BY aggregation, thus cannot be selected.
– Nhan
Nov 8 '19 at 22:40
...
Bash script prints “Command Not Found” on empty lines
...you usually just need to look at the command output immediately before the error to see what's causing the problem
If, as you say, it's the blank lines causing the problems, you might want to check what's actaully in them. Run:
od -xcb testscript.sh
and make sure there's no "invisible" funny cha...
Getting “unixtime” in Java
...creation
– brabster
Apr 8 '09 at 22:05
9
The Java 32-bit int matches 32-bit platforms (and the ye...
Using Python String Formatting with Lists
...
– Paused until further notice.
Dec 8 '13 at 16:05
This answer is potentially confusing, as it makes it look like the numerical va...
“二孩”遇上母婴产业 创业者必读的数据干货 - 资讯 - 清泛网 - 专注C/C++...
...其移动电商化进程将继续加快。
母婴健康移动终端成为连接线上与线下资源、随时随地管理孕育健康的主要通道，孕育各阶段的健康服务链逐渐形成。
作为母婴类应用中发展规模较小且增速缓慢的母婴实用工具，在激烈的...
What is the optimal length for an email address in a database?
... |
edited May 8 '14 at 7:05
answered May 7 '14 at 11:47
Right query to get the current number of connections in a PostgreSQL DB
...nection
– neonidian
Dec 13 '19 at 8:05
add a comment
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...
What is “rvalue reference for *this”?
...-value. So if this is in the type Object:
Object foo;
foo.RValueFunc(); //error: no `RValueFunc` version exists that takes `this` as l-value.
Object().RValueFunc(); //calls the non-const, && version.
This way, you can specialize behavior based on whether the object is being accessed via a...
How to only find files in a given directory, and ignore subdirectories using bash
...
205
If you just want to limit the find to the first level you can do:
find /dev -maxdepth 1 -name...