iskm/learnxinyminutes-docs
1
0
Fork 0
mirror of https://github.com/adambard/learnxinyminutes-docs.git synced 2025-05-07 15:28:32 +00:00
Code Issues Actions 2 Packages Projects 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
commit e16ad03d4a
1 changed files with 4 additions and 4 deletions
Show Stats 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: # We have the usual if structure:
# use 'man test' for more info about conditionals # use 'man test' for more info about conditionals
if [ $Name -ne $USER ] if [ $Name != $USER ]
then then
echo "Your name isn't your username" echo "Your name isn't your username"
else else
@ -91,12 +91,12 @@ else
fi fi
# NOTE: if $Name is empty, bash sees the above condition as: # NOTE: if $Name is empty, bash sees the above condition as:
if [ -ne $USER ] if [ != $USER ]
# which is invalid syntax # which is invalid syntax
# so the "safe" way to use potentially empty variables in bash is: # so the "safe" way to use potentially empty variables in bash is:
if [ "$Name" -ne $USER ] ... if [ "$Name" != $USER ] ...
# which, when $Name is empty, is seen by bash as: # which, when $Name is empty, is seen by bash as:
if [ "" -ne $USER ] ... if [ "" != $USER ] ...
# which works as expected # which works as expected
# There is also conditional execution # There is also conditional execution