To simplify the subject, we will talk about 6 possible approaches and look at some pertinent cases with the required justifications. We will use different commands and examples to delete the empty line from the file and display the file. In this article 016 Methods to Remove Empty Lines in ...
done <$INPUT_FILE # use to sed to delete any empty lines, if any sed -e '/^$/d' order.tmp >order.$ mv order.$ order.tmp else echo "`basename $0` : Sorry $INPUT_FILE does not exist or empty" fi 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17...
The file.txt is the input file the grep command uses to search for empty lines. The > is the redirection operator, which redirected the output of the grep command to the outFile.txt file. If it already exists, the> operator will overwrite the outFile.txt file. You can also use >> if...
一个例子来判断VAR为空: if [ -z "$VAR" ]; then echo “empty”; else echo “not empty”; fi 需要注意的是必须把$VAR的两头用双引号包起来。 3,双引号和单引号 说到双引号,它与单引号的区别在于如果引号之间有变量,则一定要用双引号。因为BASH不会检测单引号中的内容,也就是说单引号之中不存在特...
echo "The sum of space lines: $[$spaceline1+$spaceline2]" 执行时#bash b /etc/rc.d/rc.sysinit /etc/rc.d/init.d/functions The sum of space lines: 174 3.统计/etc,/var,/usr目录共有多少个一级子目录和文件: #!/bin/bash etc=`ls /etc | wc -l` ...
if [ -z "$VAR" ]; then echo "empty"; else echo "not empty"; fi 需要注意的是必须把$VAR的两头用双引号包起来。 3,双引号和单引号 说到双引号,它与单引号的区别在于如果引号之间有变量,则一定要用双引号。因为BASH不会检测单引号中的内容,也就是说单引号之中不存在特殊字符。echo '$VAR' 的输出...
-n Number the output lines, starting at 1. -s Squeeze multiple adjacent empty lines, causing the output to be single spaced. -t Display non-printing characters (see the -v option), and display tab characters as`^I'.-u Disable output buffering.-v Display non-printing characters so they ...
If the expansion of the items following in results in an empty list, no commands are executed, and the return status is 0. for (( expr1 ; expr2 ; expr3 )) ; do list ; done First, the arithmetic expression expr1 is evaluated according to the rules described below under ARITHMETIC ...
--insert-lines[=N], --insert-line[=N], --il[=N] --delete-lines[=N], --delete-line[=N], --dl[=N] --delete-chars[=N], --delete-char[=N], --dch[=N] --scroll-up[=N], --su[=N] --scroll-down[=N], --sd[=N] --erase-chars[=N], --erase-char[=N], --ech...
line 26) `assert_output --partial "CI_COMMIT_REF_SLUG"' failed -- output does not contain substring -- substring (1 lines): CI_COMMIT_REF_SLUG output (3 lines): ./bin/deploy.sh: join_string_by: command not found oc error Could not login -- ** Did not delete , as test failed...