4058 How do I tell if a file does not exist in Bash? 405 Write to file, but overwrite it if it exists 17 write a file, append if it exists otherwise create in bash 1 testing for file existence bash 6 Check if file exists [BASH] 1 Bash script - Check ...
-u filename - Check if file set-user-id bit is set -w filename - Check if file is writable -x filename - Check if file is executable How to use: #!/bin/bash file=./file if [ -e "$file" ]; then echo "File exists" else echo "File does not exist" fi A test expression ...
我需要一行if语句 if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then do-something &; fi 我想把任务do-something放到do-something &的后台,但是bash抱怨 bash: syntax error near unexpected token `;' 然后我试图用&和\&逃离 if [[ "$TRAVIS_OS_NAME" == "linux" ]]; then do-something \&; fi ...
not a regular file;; (ENOENT|ENOTDIR) if [ -L "$file" ]; then echo broken link else echo does not exist fi;; (*) syserror -p "can't tell: " "$err" esac fi
算完了之后会像 C 决定真假一样给你返回一个值，也就是 0 是假，其余全部是真。你可以像if (( ...
Often when shell scripting with BASH you need to test if a file exists (or doesn’t exist) and take appropriate action. This post looks at how to check if a file exists with the BASH shell. To test if the /tmp/foo.txt file exists, you would do the following, changing the echo lin...
Schrodinger's Container: A file both exists and doesn't#24753 Closed ifrhmentioned this issueJul 27, 2016 Howto build docker-engine (1.12.0-dev) from sources behind a http_proxy?#25116 Closed thaJeztahmentioned this issueDec 22, 2016 ...
Often when shell scripting with BASH you need to test if a file exists (or doesn’t exist) and take appropriate action. This post looks at how to check if a file exists with the BASH shell. To test if the /tmp/foo.txt file exists, you would do the following, changing the echo lin...
/bin/bashif[ $# -ne2];thenecho"You must input exat 2 arguments."exit1fiif[ ! -e $1-o ! -e $2];thenecho"File $1 or/and $2 doesn't/don't exist[s]."exit2filine1=$(wc-l $1|cut-d""-f1) line2=$(wc-l $2|cut-d""-f1)echo"The lines of $1 is $line1"echo"The...
#!/bin/bash if [ -z $1 ];then echo "you entered nothing" exit 1 else if [ -e $1 ]; then echo "the file exists" else echo "the file doesn't exist" fi fi 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 练习13:写一个脚本,传递一个文件路径参数给脚本 (1) 如果脚本无参数,则...