info/learnxinyminutes-docs
1
0
Fork 0
mirror of https://github.com/adambard/learnxinyminutes-docs.git synced 2025-08-27 00:26:15 +02:00
Code Issues Releases Wiki Activity

Merge pull request #2097 from matteobaglini/master

Browse Source 
[bash/en] fix comparison syntax
This commit is contained in:
ven
2016-01-13 14:58:18 +01:00
parent 7e069bef5d f94dea8379
commit e16ad03d4a
1 changed files with 4 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
bash.html.markdown
View File

@@ -83,7 +83,7 @@ echo Hello, $Name!
# We have the usual if structure:
# use 'man test' for more info about conditionals
if [ $Name -ne $USER ]
if [ $Name != $USER ]
then
echo "Your name isn't your username"
else
@@ -91,12 +91,12 @@ else
fi
# NOTE: if $Name is empty, bash sees the above condition as:
if [ -ne $USER ]
if [ != $USER ]
# which is invalid syntax
# so the "safe" way to use potentially empty variables in bash is:
if [ "$Name" -ne $USER ] ...
if [ "$Name" != $USER ] ...
# which, when $Name is empty, is seen by bash as:
if [ "" -ne $USER ] ...
if [ "" != $USER ] ...
# which works as expected
# There is also conditional execution